Sinn 556 A RS on Strap

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• Verified Watch Owner Reviews (22 reviews)
SKU: SI-525

Watch Brand: Sinn

Sinn North America

Pilot's watch with sporty red seconds hand
• Watch diameter (mm): 38.5
• Watch height (mm): 11.0
• Lug width (mm): 20
• Lug to lug (mm): 45.5
• Weight - head only (grams): 65
• Water resistance: 200 meters
• Case back: Transparent
• Case finish: Satinized
• Case metal: Stainless steel
• Dial color: Black
• Front crystal: Sapphire
• Calibre: SW200-1
• Movement: Automatic mechanical
• Strap or bracelet: Strap
• Manufacturer's limited warranty: 2 years
• Warranty service: RGM or Sinn

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WatchBuys Direct Price: $1,340.00
Availability:  In Stock - Ships Immediately

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Condition:  This Sinn watch is brand new and unworn

Authorized:  WatchBuys is Sinn's official importer and distributor
This watch ships to US, Canada, Puerto Rico, Guam and APO/FPO/DPO locations from NC using these shipping methods

Sinn 556 A RS on Strap
Sinn 556 A RS on Strap

(Click Image to Enlarge)
Product Details

If the Sinn 556 A RS (red seconds) looks familiar, you're not mistaken.  This watch is now a general release by Sinn, but for years was a WatchBuys special edition.

Our special edition was such a hit that Sinn decided to expand production and add the watch to its worldwide collection.

More Attitude

The Sinn 556 A RS has all of the great features of the bestselling Sinn 556 A, but our clients say the red seconds hand offers "a bit more attitude."

The red seconds hand gives the watch a sporty look and feel, while still providing stark contrast against the matte black dial.

The Sinn 556 Series offers a great mix of performance, durability and classic Sinn design.  For these reasons, they are among Sinn's bestselling watches of all time.

This version of the Sinn 556 RS is marked "A" for Arabic 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 four anchor numerals on the quarter hours provide positioning for a quick read of the time, and the bold indices and hands contrast well against the matte black dial.  We think this watch is one of the most legible that we carry.

Important features of this watch include:

  • Case made of satinized stainless steel
  • Sapphire crystal glass on both sides
  • Water resistant to 200 meters
  • Date display at 4:30
  • SuperLuminova on the hands and hours (glows green)
  • Matte black dial
  • Double antireflective coating
  • Low pressure resistant

This watch is fitted with a Sinn black calf leather vintage style strap with red stitching.

Frequently purchased with this item:

Watch specifications are provided by the respective watch manufacturer and/or other sources. Although we use best efforts to provide accurate information, we reserve the right to make corrections when advised of specification changes and/or content errors.

WatchBuys is the official and authorized North American distributor and importer for Sinn 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 and importer, 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 Sinn Authorized Service Center, RGM Watch Service located in Mount Joy, Pennsylvania. This added benefit saves our clients the time and effort of returning their watches to Germany for repair. This service 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 click here for instructions on returning your 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 UPS 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.

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.

Watch Reviews From Verified WatchBuys Buyers
100% • Verified Watch Owner Reviews100% • Verified Watch Owner Reviews (22 reviews)

Easy Purchase, great watch

"Easy Purchase, great watch"

Verified Watch Owner Comments: Sinn 556a rs is a no nonsense tool watch with everything you need. Highly legible dial, great lume, and accurate movement. The back of the case has a very subtle divot the lugs that allows you to use just about any type of strap.

I’ve had it for a couple weeks and haven’t taken it off. Wish they made a "no date” version of this watch, but am satisfied that Sinn made the date window so small that it almost disappears if looking at it in the mirror. Overall, outstanding watch. Would buy again.

Great Watch, Great Experience

"Great Watch, Great Experience"

Verified Watch Owner Comments: Awesome watch, love the design and fit- can't say anything but positive here.

WatchBuys made it a simple and fast process- very professional, down to the call to me before shipping out to make sure I was happy with the purchase. Thanks!

Great Watch

"Great Watch"

Verified Watch Owner Comments: Excellent customer service, I received a phone call the day after I placed the order confirming the watch I ordered and shipping address. Quick shipping and arrived when described. Everything was securely packed. The watch was just as described and came with everything it should, box, warranty card, manual…..

The Sinn 556A RS is just the right size, not too big or too small. Very comfortable on the wrist and easy to read quickly. The hour numbers are easy to see and the red second hand adds a nice touch of color. The date is a little difficult to see but it’s there when you need it. The automatic movement is running about +3 secs a day, which is outstanding.

Clearly a quality timepiece and I definitely recommend it. Im very happy with my purchase.

SINN 556 A RS on strap

"SINN 556 A RS on strap"

Verified Watch Owner Comments: Sinn knocks it out of the park again. Super well built (like a tank). Fit and finish it perfect. A real strap monster.

A little thicker than stated

"A little thicker than stated"

Verified Watch Owner Comments: This watch is terrific, but it is a bit thicker than stated in the description. Sinn has the Case Thickness listed as 11mm, but Watchbuys has it listed as Watch Height of 11mm - these are two different things as Case Thickness often does not include the height of the crystal or sometimes the caseback. When measured with a micrometer, I got an overall thickness of 11.3mm. Not a big difference, but worth noting.

Perfect “Tool” Watch

"Perfect “Tool” Watch"

Verified Watch Owner Comments: It is easy to read, relatively thin, and is beautifully finished. The leather band looks good with it, the red accents aren’t too much. Love the transparent back. Overall it is an excellent tool watch.

Shipping was fast and communication with Watchbuys was excellent.

Outstanding Watch!

"Outstanding Watch!"

Verified Watch Owner Comments: The Sinn 556 A RS is a versatile everyday watch on either the vintage style leather strap or the steel bracelet (I got the fine link bracelet, which pairs perfectly with this watch). The 556 A RS comes in a fine satinized finish, and the red seconds hand really contrasts well with the jet black dial.

All in all, a tremendous value, with the typical fast and professional WatchBuys shipping. A real winner!

Great Watch

"Great Watch"

Verified Watch Owner Comments: IT is a very good looking watch. It is comfortable (leather) and it fits great in my wrist. The date window is too small to be useful, but I do not mind. The watch is about +7 seconds a day... I was expecting less but for that you need to buy COSC . Excellent buy, I will buy it again ... I may look for another Sinn in the future.

Sinn 556A RS

"Sinn 556A RS"

Verified Watch Owner Comments: First off, kudos to Watchbuys for making this purchase so pleasurable. Shortly after ordering I received a phone call from Trey at Watchbuys wanting to confirm the order regarding the Sinn 556 A RS. It speaks volumes about Watchbuys that there would be a representative who would reach out to thank me for my purchase and also to ask if there were any questions that I had regarding this watch.

The shipping was super fast and watch arrived in a couple of days. The pictures of this watch were one thing. The actual watch is quite another. It has presence, to be sure, and the black leather strap with red stitching is a nice thick one. The unboxing is akin to the scene in "Pulp Fiction” where John Travolta is unlocking the briefcase and opening the top. My Sinn 556A RS represented the gold light that was emanating from the briefcase.

This watch is simply beautiful, well made, and has that cool hip vibe to it. Thank You very much Watchbuys!

Love Sinning!!!

"Love Sinning!!!"

Verified Watch Owner Comments: First off, great watch! I’ve owned an Omega Seamaster and the quality is just as good, if not better in some ways!! And Watchbuys has been fantastic, fast and responsive … thanks guys!!

Great all-round watch

"Great all-round watch"

Verified Watch Owner Comments: Easily one of the best value watches that you can buy right now. The quality and execution are top-notch, as one ought to expect from the Germans. It is easy to read, accurate, and well proportioned for any wrist.

WatchBuys provided excellent customer service and was quick to ship my order.



Verified Watch Owner Comments: Transaction was smooth and easy. Shipping was on time and fast. Watch is perfect, new favorite. It is beautiful, clean and simple. Makes me want another Sinn. Would definitely recommend Watchbuys to purchase your next favorite watch.

Sinn 556 A RS

"Sinn 556 A RS"

Verified Watch Owner Comments: I love this watch! It is so versatile. Perfect size and weight.

I can wear it anywhere I go and not feel out of place.

This is my second Sinn watched purchased from WatchBuys. I cannot say enough how I appreciate the professional and pleasant experience to transact with this company. Thank you WatchBuys!

The Best 556?!

"The Best 556?!"

Verified Watch Owner Comments: This is my third Sinn 556 so you already know that I love this watch. The proportions are perfect and the 556 has plenty of wrist presence but it is neither too large or too small. This just right sizing contributes to its versatility where the 556 looks equally at home with casual dress or in all but the most formal of settings. The brushed stainless steel contributes to this versatility and is amazingly well done, looking equal to the brushwork on Swiss watches costing several times as costly. The dial of the 556 A RS is what makes it my favorite 556 compared to the anthracite dial anniversary edition and the 556 I. The deep black of the matte dial is stunning and the white numerals, markers and hands appear almost floating on top of the dial. All Sinn watches feature excellent readability, but I think the 556 A RS is at the top of the heap. At night the lume is good, and remains readable most of the night. Although it may not be best in class lume, the awesomely sharp definition... - more details

Beautiful craftsmanship

"Beautiful craftsmanship"

Verified Watch Owner Comments: The Sinn 556 has such a unique, stunning aesthetic for its face. The red second hand adds dynamism to it.

The machining of the case is top-class, as is the rear view into the watch's mechanism.

The strap is strong, yet soft and easy wearing. It is substantial without being oversized, slim without being delicate.



Verified Watch Owner Comments: I found the service to be impeccable and the watch a well-crafted instrument. I highly recommend this vendor both for its service and the watch that I purchased from them.

High Quality Timepiece

"High Quality Timepiece"

Verified Watch Owner Comments: It is a timepiece built with the excellence of German quality, with a very good finish in the details, the durability and the tesustencia of the materials can be appreciated. In addition to its versatility, it can be used both as casual or as formal.

Sinn watch

"Sinn watch"

Verified Watch Owner Comments: Excellent watch at this price point. Customer service was impressive

First Sinn purchase, Flawless

"First Sinn purchase, Flawless"

Verified Watch Owner Comments: Purchased my first Sinn, 556A RS. Watch is wonderful, very accurate (seems to drop one second per day.)

Purchase experience, delivery and follow up was exceptional (watch was delivered in two days less than promised.) I will be getting another Sinn soon! The 556 is a great place to start Sinning !

Better than the Explorer!

"Better than the Explorer!"

Verified Watch Owner Comments: I have had several Rolex including the explorer I saw this watch and for the price I was interested. After Receiving it I’m impressed the quality is super 3 seconds fast a day even though not cosc Certified.

The guys at watch buys were great switching out the standard band for the long version. Way to go Sinn

My 1st Sinn, won't be my last.

"My 1st Sinn, won't be my last."

Verified Watch Owner Comments: I have been wearing Seiko automatic watches for many, many years. This year I finally decided to buy a Sinn. I have a small wrist and I really like the case size of the 556. It fits me very well and I love the simplicity & legibility.

The red second hand really helped to add more visual excitement to the watch. I'm now saving up for another Sinn.



Verified Watch Owner Comments: Easy process. Customer service excellent.

The watch itself exceeded my expectations. Good quality . A very legible dial . Handsome watch . Not a lot of thrills . The red second hand does give it a little personality. Band it came with very low quality . Rubber strap I added I love it . Rubber strap makes a difference. Seeing movement is nice . There is some finishing on it so that good too. All around nice watch.

A very fair market value. A utility work watch that looks nice but you can actually wear and use without worrying about messing it up. I’m a new fan of the brand . Watchbuys was professional, courteous and knowledgeable. Thanks