Sinn 556 I on Bracelet

Automatic winding mechanical watch in steel on bracelet
• Case diameter (mm): 38.5
• Case thickness (mm): 11.0
• Case lug width (mm): 20
• Weight - head only (grams): 65
• Case back: Transparent
• Case finish: Satinized
• Case metal: Stainless steel
• Dial color: Black
• Front crystal: Sapphire
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 2 years
• Warranty service: RGM or Sinn
° Earn 2640 WatchPoint Rewards on this purchase
WatchBuys Direct Price: $1,320.00
Availability: In Stock - Ships Immediately

Sinn 556 I on Bracelet
Sinn 556 I on Bracelet
Product Details

The Sinn 556 has become one of our best selling watches of all time and for good reason - it offers a great mix of performance, durability and classic Sinn design.

This version of the Sinn 556 is marked "I" for Indices (the dial has no numerals). 

Sinn's inspiration for the design of this watch is the historic Sinn NaBo clocks long manufactured for use in cockpits as a navigational tool.  Even today Sinn continues to produce these clocks which are used in both civilian and military aircraft, as well as specialty cars.

The difference from these clocks is that Sinn has removed all numerals from this watch and replaced them with indices.  This clean design is a primary reason that so many choose this watch as their daily wear timepiece.

The Sinn 556 I features a case size at 38.5 mm which is satinized. This finish results in a slightly more polished look while at the same time retaining some characteristics of a matte finish.

Notable features of the Sinn 556 I include:
  • Case in 316L surgical stainless steel
  • Dial has a slight surface shine rather than matte
  • Sapphire crystals on both sides of the watch
  • Double coated anti-reflective covering
  • Dual seal crown lock to improve water resistance
  • Sapphire crystal back to view the decorated movement
  • Top Grade (chronometer level) movement

This watch is fitted with a Sinn stainless steel H-link bracelet with locking clasp.

And what is very unusual for watch in this category is that Sinn has been able to engineer a water resistance of 200 meters rather than the traditional 50 to 100 meters in competing watches.

When you purchase your new Sinn watch from WatchBuys, you'll not only get a finely engineered timepiece with excellent value for money, you'll also benefit from the WatchBuys Sinn Advantage.

WatchBuys Advantage #1

Because we are the official and authorized North American Sinn distributor, your name and watch serial number will be automatically registered in our database for a Sinn manufacturer's limited warranty which we pass through.

This means that should your watch require service during the Sinn manufacturer's limited warranty period, service will be provided by Sinn in Germany when you return your watch to them. This Sinn manufacturer's limited warranty is transferable to subsequent owners as allowed by Sinn.

You are responsible for paying the shipping charges to Sinn, and all repairs that Sinn approves under its warranty are at no charge. Sinn will also pay the return shipping charges to the address you specify.

The Sinn manufacturer's limited warranty period is as follows:
  • Watches in the EZM Series: 3 years
  • Watches marked AR containing inert gas: 3 years
  • Watches in the DIAPAL Series: 5 years
  • All other Sinn models: 2 years

WatchBuys Advantage #2

As an added benefit to those who purchase Sinn watches from WatchBuys, you may choose to have your warranty repairs serviced through our US service center, RGM Watch Service located in Mount Joy, Pennsylvania. This added service saves our clients the time and effort of returning their watches to Germany for repair. This benefit is transferable to subsequent owners who purchase directly from the original registered owner.

Please note that you are responsible for paying shipping and insurance charges for sending your watch to RGM. Once they reach your watch in the service queue they will determine which repairs are covered under Sinn's warranty.

It is important to note that oil-filled quartz Sinn watches must be repaired in Germany (EZM 2, Hydro and UX series). If your watch meets one of these conditions and requires service under warranty, please contact us and we'll provide instructions for shipping the watch to Sinn in Germany.

WatchBuys Advantage #3

Your watch will be repaired at no cost to you other than shipping charges to either Sinn or RGM during the warranty period. Sinn watches purchased through the "grey market" (non-authorized sources) may carry no warranty from Sinn. Sinn watches purchased through authorized overseas retailers are governed by the warranty policies of those dealers and/or Sinn, and typically must be sent to either the overseas dealer or Germany for repair.

WatchBuys Advantage #4

You'll be wearing your new Sinn watch soon after your order is placed since we stock Sinn watches and ship free using FedEx Air. Plus, since we are located in the United States, there are no "hidden charges" for shipments to US residents as is the case with most overseas dealers. Such charges can add up to 15% to the cost of your new watch, and include credit card surcharges, foreign exchange credit card bank fees, import duties and taxes, and custom's broker charges.

WatchBuys Advantage #5

WatchBuys offers a comprehensive return policy with no restocking fees to US residents. Overseas dealers, including those involved in the grey market, typically don't offer a return policy, and if they do, returning a watch under the policy is both complicated and expensive due to import/export and custom's requirements. Restocking fees are also common and may range up to 15%.

Learn more about our return policies.

WatchBuys Advantage #6

WatchBuys is pleased to accept payments through PayPal, debit and credit cards. We charge no surcharges to use credit or debit cards, and because we are based in the United States your US card is charged in US dollars with no conversion or exchange rate fees.

We also accept payments from PayPal and charge no surcharges.

Please note that to pay by credit card, debit card or PayPal your account and/or card must be issued by US or Canadian financial institution and billed to a confirmed US or Canadian address.

WatchBuys Advantage #7

When you purchase your new Sinn watch from WatchBuys, you'll earn WatchPoint Rewards which accumulate and may be redeemed against future purchases.

Watch Reviews

Perfect watch

"Perfect watch"

Tejas S

Comments about this watch: This is probably my first serious automatic watch and so far I love it! Looks sporty enough to be worn regularly to work and dressy enough to be worn with a suit. It's also quite accurate and my watch seems to run 2-3 seconds fast / day (which I am told is very respectable).

Watchbuys were pretty easy to deal with. The day after I placed my order, I received a phone call to confirm. Two days after that, I had my watch.

Love this watch!

"Love this watch!"

Mike C.

Comments about this watch: I wanted a watch versatile enough to wear for any occasion and the 556 I checks all the boxes for me. It has a clean look and is extremely legible with great lume for after the sun goes down.

The water resistance goes well beyond anything I need so I have no worries about water damaging the movement but know I can swim with it. Pictures do not do this watch or the excellent finish justice plus it's keeping time within +5 seconds a week.

The bracelet is very comfortable and easy to resize. There is nothing I would change about this watch. Sinn nailed the design elements for the 556 in every aspect. I am one satisfied customer.

Sinn 556 I

"Sinn 556 I"

Andy D

Comments about this watch: A great watch, glad to have it.

Love the 556i!

"Love the 556i!"

Luis T

Comments about this watch: Even though this is the "entry level" watch from Sinn, it still an amazing piece! I love the simplicity and the deep black of the dial.

I initially had some issues with the bracelet that came with the watch but Kevin and Matt were very helpful and ended up sending me a brand new replacement bracelet.

I will definitely be using WatchBuys again in the future!

556 I

"556 I"

James B.

Comments about this watch: Excellent value for money. Lovely case size for my 6.75" wrist. Nice black lacquer dial, all print is crisp and with nice readability. Movement timed to ~ +2sec/day which was pretty impressive. Bracelet is nice end links have little play. The clasp is partially stamped and the bracelet rattles a little (less than the old Rolex bracelets). Crown is nice with a firm end point to its screw down. Overall, I'm very happy.

Sinn 556i

"Sinn 556i"

Andrew W

Comments about this watch: I first saw this watch 3 years ago, when I first started "getting into" watches. I oogled over pictures, memorized specs, and lusted after it until just recently. I read reviews from people with the same size wrist as myself, and talked myself into and out of the purchase several times. I am also a fan of cars. With cars there is a saying "don't drive your hero's." Essentially, cars you had pictures of as a kid (and lust after) should remain items of your adoration. Driving them is often a let down. So I was a little nervous that theory would translate to this watch. The buying process was very easy with WatchBuys, and extremely fast! FedEx delivered it right at 10am as promised. And the watch was just as I imagined it. In fact, I've owned the watch for almost a month and have only taken it off to sleep and shower, despite having several other nice pieces to wear. In short, I love this watch and the buying process through WatchBuys instills confidence in a 4 figure+ sight-unseen pu... - more details



Michael M

Comments about this watch: I was searching for a daily office / weekender watch. The Sinn 556 I with bracelet is what I decided on.

I placed the order, and the next day Wachbuys gave me a call to answer any questions and explain their policy. The watch arrived in a timely manner.

Right out of the box the watch feels just right. It has a certain heft to it without being heavy. The satinized finish is perfect. The transparent case back is a great feature. Five minutes later with the provided tool I was removing and adding links till I got it just right. If you take your time and hold the tool firmly in the screws you will not have any trouble. As good as it looks in the images it looks much better in person.

The Watchbuys experience was a very satisfying one.

First Sinn - 556i

"First Sinn - 556i"

Paul P

Comments about this watch: This watch has been running spot on since I purchased it. I have had it for weeks now, and I'm still within 10 seconds of the atomic clock. I think I got a little lucky here, but I'm sure a lot of it is attention to detail and quality. I have had many comments about the bracelet specifically. It's beautiful. The finish is somewhere between brushed and polished, so it works for any occasion quite nicely. At 38.5mm the watch itself is on the small side for my wrist (approx 7.75") but does not look too small, slips under shirts nicely. So comfortable to wear - a little weight to it but only noticeable when you think about it. Overall, I am very pleased with this everyday wear watch. I'm not going to be afraid to wear it in almost any situation. The only thing that could make this watch a bit better is the face. There is not a lot of depth - just a glossy black dial with printed on indicies. If they were raised placed indicies at the hour marks or at 12 3 6 9, and maybe a bit of textur... - more details

Love This Watch! Get Now!

"Love This Watch! Get Now!"

Joseph L

Comments about this watch: I have been lusting after this watch for a long time and finally ordered one recently. Since receiving this amazing piece It hasn't been taken off!

Pictures of this watch doesn't do this watch justice. My watch runs minus 1-2 seconds/day which is really good for an automatic watch. Look and quality of this watch makes you feel like you're wearing a watching that costs way more. You definitely won't regret this purchase.

One downside I've had with this watch was the bracelet. It was a difficult to remove the screws so I had to take it into a watch repair shop to get the links removed. Besides that no issues so far.

Perfect Experience

"Perfect Experience"

Scott B

Comments about this watch: After carefully considering my first mechanical watch purchase for several months, I chose the 556I with bracelet along with the black leather strap with deployment buckle for variety.

The leather strap was actually my first choice, but I just before ordering I decided to get the bracelet also and I'm so glad that I did! The bracelet is superb quality, comfortable and really makes the watch a perfect choice.

You will not regret a purchase through WatchBuys, the experience was equally perfect. I'm a very satisfied customer.

Sinn 556i

"Sinn 556i"

Adam H

Comments about this watch: This is a great all-rounder.

I was on the fence about this watch for some time because of the gloss black dial I generally think matte, with its slightly grey tone, is more versatile but the 556 dial is such a deep, pure black that my concern turned out to be unwarranted.

The double AR coating also helps reduce any glare from the gloss dial. I'm looking forward to wearing this watch for a long time and experimenting with different straps.

Excellent service.

"Excellent service."

Steven M

Comments about this watch: The day after I placed to order, they called to verify everything. I like the sense of security that gives.

Shipping was spot on on time.

Excellent service.

Long Term Review

"Long Term Review"


Comments about this watch: On a long term basis (more than a year), very good watch, and I am happy with the purchase. Runs within 3 seconds a day, and wears very comfortably - Omega quality, in my mind. 

The coating on the face of the crystal can get irreversibly smudged with liquids other than water (i.e. contact lens solution). I had to have the crystal replaced by RGM. On a positive note, RGM were fantastic, and now I take better care of the crystal.

Modern Classic

"Modern Classic"

Ryan A.

Comments about this watch: This watch is sublimely understated and modern without being Bauhaus spare.

It easily straddles casual/functional/formal resulting in outstanding versatiltiy.

Sinn is good

"Sinn is good"

William D

Comments about this watch: Very pleased with watch and with customer service. Watch has real presence on the wrist not too big, but reassuringly solid.

Accuracy is great within 2 seconds a day so far and lume is fantastic. Plenty of power reserve and very easy to read under any conditions. Easily comparable in fit and finish to watches costing 5-10x more. 

Worth every penny.

Great Buy

"Great Buy"

Patrick W.

Comments about this watch: My Sinn 556 I has been everything I hoped for and more. Looks great. Works well.

WatchBuys was great. I called several times and emailed before making my purchase. They were patient and informative.

It's a keeper..!

"It's a keeper..!"


Comments about this watch: The 556i is perfect size and weight as an everyday watch on my 7.25" wrist.

As expected, the build quality is superb; it looks and feels like a timepiece costing much more.

Both the 556i and the interaction with WatchBuys exceeded expectations.

It was shipped the same day it was ordered and arrived early the next morning, already set to the correct date and local time. Nice touch. I am very happy with the purchase. I wouldn't hesitate to recommend the 556i or WatchBuys to anyone.

First time Sinn buyer

"First time Sinn buyer"

Matthew M.

Comments about this watch: All around terrific experience in selecting and ordering the watch. WatchBuys responded immediately to my email question concerning a feature on the watch.

The Sinn 556I model is a well-constructed and solid watch that, while minimal in design, is nevertheless suitable for any occasion.

Perfect Watch

"Perfect Watch"

Jackson C

Comments about this watch: First off, WatchBuys provided excellent customer service. Buying the watch was a smooth, easy process.

They called me to confirm the details and answer any questions. Shipping was fast and perfectly packed. Excellent. The watch itself is perfect.

Excellent watch, excellent service

"Excellent watch, excellent service"


Comments about this watch: This was my first shopping experience with WatchBuys, and I'm certainly pleased all the way around.

The company was straight up about announcing that Sinn would be increasing its prices and this would be an opportunity to acquire a Sinn at the old price. They personally confirmed the order and everything appeared in pristine condition and in a very timely manner.

The watch itself is a joy, and I'm so happy to find that not every watch made for men these days is (for my wrist and taste) overly large. The Sinn 556 is, to me, timeless and will outlast the current over-sized trend.

Very nice watch

"Very nice watch"

Charles F

Comments about this watch: Went on a cruise with this watch as the one and only, fit in for every occasion, swimming, lounging, Captains formal dinner, etc.

On one of the Ports of Call I went into a jewelry store and did a side by side with a Rolex Explorer I 39mm. I then and there cancelled any lusting I had for that Rolex, the Sinn looked nicer and had a fit and finish at least the equal to that of the Explorer, the brushed finish looked a lot classier then the polished blingy look of the Rolex.

The edges of the Sinn bracelet were smooth while the Rolex's was sharp and uncomfortable. Any interest I had in the Explorer (and I had lots) disappeared with a side by side comparison.

Interestingly the sales agent looked at my Sinn 556I front and back, having never seen one before, she then asked my what was the price, $4K or $5K I just smiled.

Sinn 556 I

"Sinn 556 I"

Robert M.

Comments about this watch: Beautiful watch.

Others had mentioned that the crystal smudges easily and I would agree, but the size, simplicity and beauty outweigh that fact.

WatchBuys was great to work with.

A beautiful, versatile watch

"A beautiful, versatile watch"

Ian J.

Comments about this watch: The Sinn 556I on a bracelet looks great with a suit or casual clothes. The simple dial is striking, easy to read, and the non-reflective sapphire seems invisible. It has a lot of presence for a relatively small watch. The bracelet is comfortable and secure, and easy to adjust.

This was my first purchase from Watch Buys, and the experience exceeded my expectations. I highly recommend them.

My first Sinn!

"My first Sinn!"

Gerard L.

Comments about this watch: I first heard of the Sinn 556 through the watch snob in askmen. He called the 556 on leather the worlds greatest $1000 watch. I then researched the company and ordered it on a metal bracelet that night at around 1 in the morning. I absolutely love it!

The fact that I will likely see very few others in my life time is appealing, then of course the amazing design! Sinn follows the philosophy of Porsche in design in which form follows function. The final product is pure perfection!

I have received many compliments on the watch any time I have worn it and it has quickly become one of my favorites! Not to mention all of the exclusive construction features which are built into the watch and developed and used only by Sinn. So yes, I am very happy with my first German Automatik!

Daily Wearer for Every Occasion

"Daily Wearer for Every Occasion"

B Edward

Comments about this watch: I purchased this watch on the bracelet, which looks great for business casual or just with jeans. I have swapped out the straps for leather and have worn with suits. I've thrown a rubber strap and a Nato on and wore it to the lake last weekend.

This watch is durable and is well suited for, honestly, any occasion or environment I can imagine. I'm thrilled with it. Fit and finish are top notch and the piece really looks fantastic in person. The pics on the Web don't do it justice.

My only complaint is that there is no differentiation between the 12:00 marker and the rest, but not a big deal to me, really. Workhorse 2824-2 and Sinn durability and quality. Great watch and a great value!

Sinn 556: a great way to get started on your collection

"Sinn 556: a great way to get started on your collection"


Comments about this watch: The Sinn 556 turned out to be exactly what I wanted: a clean-looking and well-priced basic mechanical watch.

This was my first mechanical watch and I'm looking forward to doing business with WatchBuys for my next watch (which I've already picked out!)

Great Watch and Great Service

"Great Watch and Great Service"

Frank B.

Comments about this watch: This watch is astounding in its simplicity and presence on the wrist. Great service and shipping from Rob and Matt. It is a pleasure and a privilege to do business with these folks.

At 38.5mm, the watch fits perfectly on my 7 3/4" wrist. I love the stick hour markers and the simple to read dial in daylight or dark. Highly recommend the watch and this company. NOMOS Tangomat (38.5mm) and/or NOMOS Club Automatic is my next goal.

Thanks again for the great service, consultation time and shipping (super fast).

Finely detailed watch

"Finely detailed watch"


Comments about this watch: I bought a 556I from Watchbuys in Jan13. Here are my initial impressions. Watchbuys was great, professional, pleasant to talk with, responsive and performed all tasks as scheduled. Packaging, first-rate.

The watch itself is exactly as hoped - classic, elegant, and well-designed and made. The steel bracelet had some issues. In shortening the bracelet per Sinn's instructions, two of the screws came out readily and properly, two didn't (too tightly glued/screwed in) so I had to take it to a jeweler. It took two trips to fix the bracelet. In retrospect, I would have gone to the jewelers initially to shorten the bracelet. The quality of the bracelet itself is high, and the watch is really finely made and detailed. The pictures don’t do it justice.

Sinn 556 - Perfect first Sinn

"Sinn 556 - Perfect first Sinn"

Michael T

Comments about this watch: For the longest time I struggled over my first Sinn: the 556I or 556A. When the package arrived, I was pleasantly surprised and glad I chose the Sinn 556I.

The Sinn 556I at first glance is handsome and as legible as others have said. The piece wears well on my 6.5" circumference wrist and its white-to- black contrast dial makes it legible from a distance perfection in a 38.5 mm case package.

I wholeheartedly recommend this piece for any first time Sinner.




Comments about this watch: Sharp Watch,understated elegance,Extreme legibility, suits almost any occasion.

You will receive compliments only from real watch lovers. The regulars might think it is very minimalist at best.

Daily wearer and Keeper for sure. Very accurate too.

Very Classy

"Very Classy"


Comments about this watch: The 556 looks amazing.

The gloss black dial goes nicely with the bold white markers and hands. The proportions are perfect and the case has a great brushed finish. The bracelet is simple yet robust.

First Automatic

"First Automatic"


Comments about this watch: After lots of research I pulled the trigger and bought the 556 I. It did not take long to choose the 556 I over the 556 A. Like the minimalist dial.

This is my first "nice" watch and have been very pleased with it although I've only had it for two days. It appears that the watch has gone up in price quite a bit over the last few years but after my research I still think its a great deal when compared to a Xetum or others. I've wanted a Seamaster for years but honestly prefer the minimalist design of the dial and the metal bracelet is definitely more attractive, in my opinion, than the Omega.

I just bought this watch last week and it appears that it no longer ships with thread lock, no big deal. I like that this watch is rare in the States and no one I know owns one or has heard of Sinn. Nice watch and still a good deal, in my opinion.

A (somewhat) unexpected surprise...

"A (somewhat) unexpected surprise..."


Comments about this watch: I had read a number of reviews about Sinn watches, and had come to understand that in the world of non-manufacture watches, they were about as good as you could get.

As the first entre into my Sinn purchases, I chose the 556I. I am 58 and have found that some of the watches I have are very trendy, but really don't sit well on the wrist. (2 Oris's and a Cartier). This watch feels perfect,especially with the deployant clasp installed. The dial is the absolutely the most legible that I have seen.

Knowing that, with ETA offering 5 levels of calibres, and that Sinn uses the top line, makes me feel great about this purchase. The movement even has blued screws.... What more could you want at this price range?

Sinn 556

"Sinn 556"

Kevin W.

Comments about this watch: This is a great all around watch. Fine build quality to this piece. The watch has a beautiful yet simple ink black dial that is both easy to read and flat out cool. The anti reflective coating on the sapphire crystal gives off flashes of blue at certain angles . . . very cool.

The satin or brushed case and bracelet are very well done. The watch works well with a suit to jeans with a t-shirt. If I could only have one . . . ahh . . . that's not going to happen! Buy it!



Ricardo K

Comments about this watch: Look around the Internet and everyone who owns or has owned this watch will agree: it's beautiful.

This watch has become my new daily and will stay in the collection. The manufacturing on the 556 is top notch and after an incredibly detailed examination of all aspects, I'd say it is definitely worth the asking price.


Only the essentials

"Only the essentials"

Kevin G

Comments about this watch: I got this watch about 6 months ago & couldn't be happier. I wear it daily. The design is simple and elegant. The band does get scuffed up through daily use, but that doesn't bother me. I don't mind the subtle signs of wear.

The anti-reflection coating on the glass does show fingerprints very easily, but the tradeoff is a glass that's virtually invisible (when clean).

Very pleased with my purchase.



Craig B.

Comments about this watch: Just received it, first review. I am very impressed and more than pleased with my decision to buy a Sinn watch. Incredibly high quality for the $. The fit, finish, and quality of materials are all among the highest I have seen in watches costing up to twice as much. I went over the case, band, clasp, crown, and movement with a very discerning eye and can report that no shortcuts on quality were taken. Some well known brand watches seem to skip the important details of making the ENTIRE watch with precision and quality and use cheap bands or flimsy clasp, etc. Not Sinn, they follow through on quality with the entire watch. The dial is so beautifully simple, clean, easy to read but also enjoyable to look at (it is a gloss black vs. most Sinn's w/ a matte black). I was concerned the watch would be a bit small at 38.5mm on my 7.5 inch wrist.....IT IS PERFECT. The 40mm+ watches, when made as high quality as a Sinn, get too heavy and are uncomfortable to wear IMO. This watch at 38.5mm fits g... - more details

Good Choice

"Good Choice"


Comments about this watch: Nice simple face, compares favorably to a Rolex Datejust, though in a better size & without the eyesore cyclops.

The satin finish works well and makes it look like a more expensive watch. My only complaint is that after 1 week of everyday wear the bracelet clasp is all scratched up. Next time I'll go for a Tegimented Sinn version.

Sinn watches feature a number of cutting edge technologies, many of which are unique to Sinn. Please note that not all Sinn watches, including the watch on this page, use all of these Sinn technologies.

Among the more notable Sinn technologies are:

Tegimented Hardened Cases

Many Sinn watches are fitted with Tegimented cases produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

Standard steel used by most watch companies has a hardness of between 200 and 240 HV (Hardness Vickers is a common scale used to measure material hardness). The Tegiment process produces a hardness of at least 1,200 Vickers which is five times harder than standard steel (and on some Sinn models up to nine times harder than standard steel).

The Tegiment process is not a coating consisting of a foreign material; instead the steel itself that has been hardened using a special engineering process that creates a hardened barrier. The base material is a type of stainless steel also used for surgical implants, and the stainless steel resistance to corrosion is further improved by the Tegiment hardening process.

The primary advantages to a Tegimented case are extreme resistance to scratches and other case abrasions, as well as increased resistance to corrosion.

Please note that certain Sinn watches are fully Tegimented (case, bezel) while others are Tegimented only on the bezel. Use the links below to view both categories.

  • View Sinn watches with fully Tegimented cases.

  • View Sinn watches with Tegimented bezels only.

Dehumidification Technology

A number of Sinn models feature cases filled with inert gas. Sinn has found that filling the case with inert gas can help prevent the introduction of moisture and humidity to the case, as well as provide a more stable environment for the oils that lubricate the movement.

The proper care of any mechanical watch movement mandates that these oils maintain both their viscosity and lubrication properties.

  • View Sinn watches with dehumidification technology.

Copper Sulphate Capsules

A number Sinn models use one or more copper sulphate capsules to absorb humidity trapped inside the case. Over time these capsules will gradually turn dark blue indicating that humidity has been absorbed.

The primary benefit to these copper sulphate capsules is a more dry and stable environment for both the movement and the lubricating oils. Together with Sinn's inert gas treatment these capsules form the basis of Sinn's Dry Hold Technology.

This technology not only provides a more stable environment for the movement, but also prevents fogging of the crystal when going from hot to cold environments or from humid to non-humid conditions (such air conditioned buildings).

  • View Sinn watches with copper sulphate capsules.

Extreme Antimagnetic Protection

Magnetism can cause dramatic swings in the timekeeping of a mechanical watch movement. People are often exposed to magnetic fields without even being aware - frequent high altitude flying, metal detectors, audio and video equipment, medical equipment and computer equipment can all cause problems with magnetism.

Many Sinn watches offer extreme protection against magnetism up to 80,000 A/m. Sinn achieves these results using a number of different technologies, including special case and case back construction, soft iron components in the case and protective rings surrounding the movement.

  • View Sinn watches with extreme antimagnetic protection.

DIAPAL Oil Free Escapement

Sinn caused quite a stir when they first released their DIAPAL technology. Beginning in 1995, Sinn began work to create an oil free escapement. With any mechanical watch movement, the aging of oil, especially in the escapement can create long term problems for that movement. Additionally, as movement oil ages, required service intervals become more frequent.

Sinn's early analysis to this problem provided a quick solution (at least in theory) - if you don't use oil, it can't age. The process began by exchanging the ruby escapements for diamonds (the word "DIAPAL" derives from the German name for diamond escapements) in order to achieve the desired effect. The designation stuck, even though today Sinn works with solutions taken from advanced nanotechnology rather than diamonds.

The result is a movement that proves so reliable that Sinn offers an unprecedented five year warranty on their DIAPAL watches.

  • View Sinn watches featuring the DIAPAL oil free escapement.

Hydro Oil Filled Technology

Sinn has developed a technology termed "Hydro" in which the entire watch case is filled with oil. Watches using this technology are based on quartz rather than mechanical movements.

By using this type of movement, Sinn is able to fill the watch with oil, which has the joint affect of greatly enhancing the readability of the dial and time from any angle (including under water), and increasing the water resistance of the watch even at great depths.

  • View Sinn watches with Hydro Oil Filled technology.

Submarine Steel

Sinn has created a line of watches featuring cases made from German submarine steel (the U Series). The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany's North Sea shipbuilding yards who construct submarines from the very same steel.

Because of the special steel used from the submarine steelmanufacturer, the case resists the effects of exposure to salt waterand salt water environments.

These cases are produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized. The watch movement itself is protected from magnetic fields up to 4,800 A/m.

  • View Sinn watches built from German submarine steel.

EZM Mission Timers

Sinn is a partner for manufacturing watches for the German Special Forces, including SWAT, Customs, FBI, helicopter police, GSG9 and other units.

Beginning with the now highly collectible (and valuable) Sinn EZM 1, Sinn has grown this collection to some of the most durable and highly functional watches made and they remain among the most popular in the collection.

  • View Sinn watches in the EZM Series.

TESTAF Certified Pilot's Watches

Lothar Schmidt, Sinn's CEO and owner had long been disturbed by a lack of technical standards for defining a "pilot's watch". As an engineer, Mr. Schmidt was fluent in standards for diver's watches, anti-magnetic watches and the many other technological standards used to manufacture watches.

A widely used reference for standards is DIN, or the Deutsches Institut fr Normung (German Institute for Standardization). Oddly, he discovered there were no DIN standards to cover pilot's watches where such standards existed for example for diver's watches.

The new "Technical Standard for Pilot's Watches" (TESTAF) was developed by the Aachen University of Applied Sciences and establishes the suitability for professional use as a pilot's watch.

  • View Sinn watches in the TESTAF Series


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