Sinn 903 Column Wheel St BE on Strap

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• Verified Owner Reviews (13 reviews)
SKU: SI-358

Watch Brand: Sinn

Sinn North America

Automatic winding column wheel chronograph with deep blue dial
• Watch diameter (mm): 41.0
• Watch height (mm): 14.5
• Lug width (mm): 22
• Lug to lug (mm): 48.5
• Weight - head only (grams): 88
• Water resistance: 100 meters
• Case back: Transparent
• Case finish: Polished
• Case metal: Stainless steel
• Dial color: Blue
• Front crystal: Sapphire
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 2 years
• Strap or bracelet: Strap
• Warranty service: RGM or Sinn

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WatchBuys Direct Price: $3,580.00
Availability: Temporarily Sold Out

Sinn 903 Column Wheel St BE on Strap
Sinn 903 Column Wheel St BE on Strap

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Sinn 903 Column Wheel St BE on Strap
Sinn 903 Column Wheel St BE on Strap
Sinn 903 Column Wheel St BE on Strap
Sinn 903 Column Wheel St BE on Strap
Product Details

The Sinn 903 Series has a long and rich heritage with close ties to the original Breitling watch company.  When Helmut Sinn developed the Sinn 903 Series he created not only a classic for that time but one that endures today.

This watch now features a Manufacture La Joux-Perret 8000 column wheel chronograph movement.

The Sinn 903 St BE pays homage to Helmut Sinn's original creation by featuring a stunning dark blue aviator's dial with luminous ivory coated hands and indices.

The color of the SuperLuminova that Sinn chose for this watch closely mimics the color of luminous materials used in the 1960's and early 1970's and when contrasted with the blue dial create a vivid look.

Much of the design work for this watch came from direct feedback from Sinn collectors and enthusiasts around the world asking Sinn to produce a 903 series true to its roots.

The Sinn 903 St BE was designed from the ground up to meet the needs of professional aviators. Modified register placement aids in performance, while internal slide rule ring provides additional data. This rotating inner ring with logarithmic scale divisions is set by a crown at 10.

Automatic winding mechanical chronograph movement with power reserve of 42 hours.  Functions include hours, minutes, subsidiary seconds, date and complete chronograph functions.

Polished steel case with sapphire crystal front and back. Open back reveals the nicely finished movement with Sinn rotor. Other features include offset date at 4:30 and water resistance to 100 meters.

This watch is low pressure resistant and features a screw down crown and Sinn calf leather strap.

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.

DIN 8330 / 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) and DIN 8330 were originally 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 DIN 8330 / TESTAF Series


Watch Reviews From Verified WatchBuys Buyers
100% • Verified Owner Reviews100% • Verified Owner Reviews (13 reviews)

Wonderful Service!

"Wonderful Service!"

Verified Owner Comments: After lots of research I decided on this watch. The quality and overall looks of this watch are phenomenal.

I was really impressed with WatchBuys customer service. I really appreciated the phone call when my watch arrived. They verified the shipping information and reminded me that I needed to be there to sign for the package. An all around top notch experience.

Sinn 903

"Sinn 903"

Verified Owner Comments: Very pleased with this watch … It is my 4th Sinn watch over the past 20 years and like the other 3 it has performed flawlessly … my only suggestion would be to improve the luminous of the hands … otherewise a true masterpiece

Very satisfied

"Very satisfied"

Verified Owner Comments: This is an amazing piece. As a watch collector I was very pleased with design color dial and strap. Feet’s great. Beautiful piece of engineering

Blue Nav

"Blue Nav"

Verified Owner Comments: Absolutely gorgeous watch! I waited for this to get back in stock and jumped on it as soon as it was available. Couldn’t be happier! Looks fantastic! Perfect size for my 6.75” wrist. The blue is incredible paired with dark brown strap. Movement keeps fantastic time.

Entire process with WatchBuys was smooth and painless. My first purchase was so good I bought another Sinn!

Better than I thought it would be!

"Better than I thought it would be!"

Verified Owner Comments: I love my Sinn 903 St BE! It's comfortable to wear and surprisingly easy to read, despite how much information is presented on the dial. Admittedly, I'm a geek who can use a slide rule so that function was easy for me to pick up on this watch.

It's kept time more accurately than 2 COSC watches in my collection, which was a pleasant surprise. In one week of wear, it's gained 2 seconds! The dial is a bit dim in the dark but I am, admitted, more used to diving watches which tend to be brighter than aviation ones.

I'm a very happy customer 😀

Beautiful watch

"Beautiful watch"

Verified Owner Comments: I've waited 1 month with this watch before giving my review... As a pilot, I have always been attracted to the Breitling Navitimer. When I learned it had a cousin in the Sinn 903 I read as many reviews as I could and decided to purchase. It is a beautiful watch with excellent detail, and at a third of the price and more robust water resistance it is a no-brainer.

The blue dial with brown strap and deployment clasp gives it a warm vintage look. Although not COSC rated, it gains only 3 sec/day. Very Happy with purchase.

Sinn 903 Exceeds Expectations

"Sinn 903 Exceeds Expectations"

Verified Owner Comments: This watch is absolutely stunning with the attention to detail and quality one has come to expect from Sinn. I have been admiring this watch from afar and am glad I finally purchased. The 903 hasn’t left my wrist since it arrived. In fact, I could make the argument that this 903 combined with the Sinn 104 I own could be the perfect two-watch collection. In my opinion, both of these watches rival timepieces 3x the price.

Thanks to the professional WatchBuys team for another great experience.



Verified Owner Comments: Love the watch!! Dial is a subtle dark blue with faux vintage patina. Great combo! 41mm size is perfect. I do recommend thinner leather strap (my preference) vs padded one. Dark brown looks great with blue.

Very happy with my purchase

"Very happy with my purchase"

Verified Owner Comments: Pros: The watch face is simply stunning and the materials and build are very good. Watchbuys customer service. Cons: Harder to read because the dial is so busy. The bezel is tight and difficult to move.

Great Watch

"Great Watch"

Verified Owner Comments: I had been considering this watch for over six months prior to purchasing it, and after wearing it non-stop for the past week plus, I can definitively say it was worth the wait. The quality and the detail are amazing, and it wears like a charm. I have relatively small wrists (6.5), but it still wears well and does not over-hang my wrists.

It has been performing quite well: anywhere from +3-5s/d, and the chronography has been accurate and responsive. Would highly recommend it to anyone considering it.

Sinn 903 St BE

"Sinn 903 St BE"

Verified Owner Comments: This watch punches above its weight.

Amazed by this Watch and Watchbuys

"Amazed by this Watch and Watchbuys"

Verified Owner Comments: First off, this watch is simply amazing and looks even better in person. In fact, I think it gets better looking the more I look at it. Seriously. The quality is top notch and that dial is simply to die for. To think I actually considered a Navitimer at one point is absurd in my opinion.

If you're on the fence like I was, do yourself a favor, pay 1/3 the price and buy this instead. You won't be disappointed.

Not only was Rob with Watchbuys extremely helpful, but also a delight to talk to about the history of Sinn and this watch. I was very impressed. Lastly, the watch arrived in 2 short days. Overall an amazing experience.



Verified Owner Comments: The folks at WatchBuys were very helpful in helping me to pick out this watch. The watch itself is very durable and also great for everyday wear. The detail of the face looks great I'm always receiving compliments on the watch!