Sinn 556 A on Strap

Automatic winding mechanical watch in steel on strap
• 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 2160 WatchPoint Rewards on this purchase
WatchBuys Direct Price: $1,080.00
Availability: In Stock - Ships Immediately

Sinn 556 A on Strap
Sinn 556 A on Strap
Sinn 556 A on Strap
Sinn 556 A on Strap
Sinn 556 A on Strap
Sinn 556 A on Strap
(Click Images to Enlarge)
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 "A" for Arabic numbers. 

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.

We think this watch is one of the most legible that we carry.

The four anchor numerals on the quarter hours provide positioning for a quick read of the time.

And the bold indices and hands play well against the matte black dial providing excellent contrast.  There is a good reason that this design has worked so well in cockpits around the world.

The Sinn 556 A 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 A include:
  • Case in 316L surgical stainless steel
  • 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 black calf leather strap with white stitching and tang buckle.

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

This one hits everything just right!

"This one hits everything just right!"

Chris L.

Comments about this watch: I recently bought a popular retro diver that was about 3x this price and while it was a nice watch, it just never quite felt right. Too big, too blingy, and just too much. I decided to sell it and finally try a Sinn for the first time after always eyeing the 556. I selected the 556A because I like the unique and small date window placement and the matte finish dial. I wasn't sure I loved the numerals in pictures but after getting it on my wrist I absolutely love them and am very glad I selected this version. This watch just hits everything right. The 38.5mm size is perfect even on my 7.5 wrist. After one day of wearing it it doesn't feel even the slightest bit small and is way more comfortable than the 42mm I was wearing before. Legibility is excellent and the fit/finish of the case, dial, hands is just perfect. The case may be one of my favorite parts of this watch as everything just seems perfectly sized, proportioned, and designed for functionality. It feels like a tough wat... - more details

Sinn 556A - Unbeatable Value!

"Sinn 556A - Unbeatable Value!"


Comments about this watch: Beautifully designed and executed watch - case is stunning, with clean lines and finishings. The dial is a modern classic - easy to read with a pilot/sporty look. ETA 2824-2 movement is a time tested and proven engine. Overall, excellent value.

This watch has become my daily wear. Looks great with leather strap, NATO strap, or steel bracelet.

WATCHBUYS was easy to work with. Watch delivered as advertised and on time. Extremely satisfied customer.

Sinn 556 A

"Sinn 556 A"

Ben S

Comments about this watch: Fantastic watch. Great customer service.

I called twice with questions and they were nothing but awesome! Will buy again soon.

Nice little watch

"Nice little watch"


Comments about this watch: This is a great all around watch. 

It was my first mechanical watch and am very happy with it. It has gotten multiple compliments with its clean features and dial. 

The crystal seems to disappear at certain angles. I had purchased it with the leather strap and will likely pick up the bracelet at some point. 

My wrist is about 7" and this is a good size as it seems to wear a bit bigger than its 38.5mm diameter would suggest. 

The 556A keeps good time and is a great watch to start a collection with.



Jason G

Comments about this watch: I've had my 556 for about a month now and couldn't be happier.

Really classy and versatile watch. Elegant looking with the leather strap or tough with a nato. I enjoy the simple, uncluttered look of the face and the beautiful open back.

This watch can be dressed up or down for any occasion and is built to last a lifetime.

Oh my! I gave it away. Sinn 556A

"Oh my! I gave it away. Sinn 556A"

Robert B

Comments about this watch: The perfect replacement for the 45 year old Rolex Sub I gave to my son ( you never really own ...)

The Rolex cost $175 MSRP in 1969. That's approximately $1,000 now. What a 556A cost.

And they both are very code to doing what it is they are supposed to do. For me WR to 200 Meters, same as the Sub. Truth is I replaced the Sub with a Mid Size Omega Seamaster. James Bond had a lot to do with why I bought the Sub to begin with.

But anyway. What's with the second crown Helium? And the bezel only rotates in one direction. How will I time a steak on the grill? Yeah the Sinn 556A. Not too fancy.

But it does what it ought to do. For a lost less than the Rolex Sub's current $7,000 price.

A Watch that says it all. Distinctive and Sporty

"A Watch that says it all. Distinctive and Sporty"


Comments about this watch: In my collection- of Omega's and Oris. This watch undoubtedly has the features that make this is one with distinction and sportiness to accompany any occasion. 

Clear, professional yet elegantly clean. A must for any Swiss watch owner- German watches are comparable.

556 A Follow-up

"556 A Follow-up"


Comments about this watch: 13 days since delivery......+19 secs! OUTSTANDING!




Comments about this watch: One week with 556A. Has been worn, rested on night stand or maintained on winder. Currently it is running +5 sec over a 6 day period! How amazing for the little engine that could! (Top Grade 2824-2)

Everything else about watch is outstanding. 38.5mm dia is my sweet spot. Fit/finish excellent. Most notably, the legibility is the BEST of my collection of approx 30 timepieces. Thanks to Tim for his advise. This will not be my only Sinn!

Love my 556A

"Love my 556A"


Comments about this watch: I love almost everything about this watch. I wear it with a red carbon fiber band with the Sinn deployment buckle and it looks great.

Always wondered why, unlike the other Sinn watches, this one does NOT say "Automatik" in the lower half of the dial. Also, I agree with other Sinn watch lovers that the satinized finish does scratch rather easily. If I had a choice, I'd opt for a regular polished stainless steel look. One last thing, mine is running a bit slow - sure an adjustment can take care of this.

Overall, a great watch for the price.

First Sinn Watch

"First Sinn Watch"

Jeff Hay

Comments about this watch: Excellent craftsmanship.

First watch I've purchased in this price category and I am very happy with WatchBuys service and my Sinn watch.

Fantastic Piece!

"Fantastic Piece!"

Peter A

Comments about this watch: I already own many Sinn watches including the 556I and so I knew what to expect with the 556A.

The 556A has the classic Sinn pilot dial which I love so much. The time is instantly legible, the lume is excellent and this is the only model sporting that lovely dial that comes in a satin finished case. The fit and finish is absolutely top notch as in every Sinn watch.

This series has a smaller case size than I have worn in the past few years but on a Maratac Zulu strap it feels a bit larger and is extremely comfortable. I can't say enough good things about this watch and also the sister model, the 556I. I switch back and forth with these two every day.

Very simple but elegant timepiece

"Very simple but elegant timepiece"

Jason Jarvis

Comments about this watch: I ordered this watch after debating a series of slightly more and slightly less expensive timepieces. I had it in mind to buy a watch that "watch people" would know and like but "non watch people" would never have heard of.

I wanted a classic look watch without a lot of hoopla or more than 40mm, that I could wear to work or out to a formal affair. I have been extremely pleased with the Sinn so far. I have two minor issues: one is that the power reserve seems fairly small to me it really needs regular winding or wearing and two, the seconds hand ticking isn't as smooth as I'd hoped. But it nailed what I was looking for in a daily wear watch.

Crazy about this watch

"Crazy about this watch"


Comments about this watch: After much looking at other German watches like Damasko and Glasshutte, I chose this model to replace my Breitling Chronospace.

What is it about this watch?

"What is it about this watch?"


Comments about this watch: Balance and Proportion that's what. It seems that watch devotees, including me, are obsessed with this watch (or its cousins 656, and 856). Everything is in perfect balance. The size and shape of the numbers, the way the hour and minute hands are in proportion and tapered just right.

By contrast, take a look at the current Bell & Ross 123 or 126. Those large, skinny numerals look awful. I have an IWC Pilot Mark XVI, a Rolex Explorer II, a Fortis Cosmonaut and a Muhle Glashutte SAR; but the 556A is the watch I wear. I hardly even look at my other watches.

Nice watch!

"Nice watch!"


Comments about this watch: Great look and feel. Had been debating between several pilot style watches, but didn't want something over 41mm. Went with this over the IWC and I am very happy with my choice.

Unique and well made. Keeps very good time. Word of warning the case does scratch easily.




Comments about this watch: Nice watch.

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


Other Considerations
Clients viewing this watch also consider these watches ()
Sinn 556 A on Strap
Price $1,080.00
Sinn 556 I on Strap
Price $1,080.00
Sinn 556 I on Bracelet
Price $1,320.00