Sinn 903 St HB Limited Edition

SKU: SI-0007

Watch Brand: Sinn

Sinn North America

Limited Edition 500 Pieces

Automatic winding column wheel chronograph with light 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: 200 meters
• Case back: Transparent
• Case finish: Mixed
• Case metal: Stainless steel
• Dial color: Blue Sunburst
• Front crystal: Sapphire
• Calibre: Manufacture La Joux-Perret L112
• Movement: Automatic mechanical
• Strap or bracelet: Both
• Manufacturer's limited warranty: 2 years
• Warranty service: RGM or Sinn

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WatchBuys Price: $4,170
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition

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Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Sinn 903 St HB Limited Edition
Product Details

Important Update

We have sold out of our allocation of this limited edition Sinn watch.

Should Sinn later make an additional allocation available to us, you may add your name to the notification list by completing the form below and we will contact you by email.

Some History You May Already Know

1979 was a great year if you loved disco music (9 of the top 10 songs for the entire year were of that genre).  1979 was also a great year for Helmut Sinn.

Herr Sinn had a keen sense of finding interesting watch components, and in this case those components came from the original Breitling company owned at the time by Willy Breitling.

Along with many other watch companies suffering from the effects of the quartz crisis, Breitling sold off watch components to several companies (including Sinn) and entered voluntary liquidation to pay off their outstanding debt to Willy Breitling.

By using those components, and later creating their own, Sinn introduced the Sinn 903 Navigation Chronograph which remained one of the most important watches in the Sinn collection until very recently.

Bad News is Now Finally Good News

Approximately two years ago, Sinn informed us that the then current 903 Series would officially be retired.  From the day we publicly announced that news until today, requests about the possible return of a newly engineered Sinn 903 have been constant.

The main question from our clients was certainly understandable.  "Why would Sinn even consider retiring such a historical watch?"  

Now we can provide the answer.  Sinn was simply doing what they do best - innovating.  Sinn and we are pleased to finally announce the latest evolution of the Sinn 903 - the brand new Sinn 903 St HB Limited Edition. 

Sinn will produce only 500 pieces of this limited edition version with the special light blue sunburst dial, no date, and presentation packaging which includes both a shell cordovan strap and stainless steel fine link bracelet.

New Innovations and Engineering

The new Sinn 903 St HB Limited Edition incorporates special Sinn technological developments and features a number of notable changes to the original Sinn 903:

  • Increased water resistance from 100 to 200 meters
  • New externally rotating bi-directional interior bezel under the sapphire crystal
  • New case design without additional crown at 10
  • Luminous hybrid ceramic material on hour markers and hands
  • X1 SuperLuminova for enhanced legibility at night
  • Applied and raised Sinn logo
  • Power reserve of 60 hours
  • Light blue electroplated dial with sunburst decoration
  • No date complication

Increased Water Resistance

For many years, Sinn set a goal to increase the water resistance of the Sinn 903.  Although the 100 meter rating of the original watch was quite impressive compared to its competitors, Sinn prefers to engineer their watches to a water resistance of at least 200 meters.  

The development of the Sinn 717 Chronograph was a turning point.  For that watch, Sinn created a bi-directional interior bezel beneath the sapphire crystal that can be rotated externally using the outer edge of the watch like a standard pilot's bezel. 

This technology allowed Sinn to reengineer the case of the Sinn 903 St HB Limited Edition, remove the additional crown at 10 previously needed to operate the internal bezel, and double the water resistance rating to 200 meters.

A Special Light Blue Sunburst Dial

The Sinn 903 St HB Limited Edition features a light blue electroplated dial with a sunburst decoration.  This unique shade of blue has never been featured on a Sinn piece.

The applied numerals and hour markers "stand out" as noticeably different from their predecessors.  For this watch, Sinn engineered a luminous ceramic material that incorporates X1 SuperLuminova (glows blue) into the actual casting process rather than simply painting the markers after they are produced. 

These applied numerals and hour markers are applied to the dial by hand.  This same hybrid ceramic technology is used to produce the luminous elements on the hour and minute hands. 

Additionally, the Sinn logo is raised and applied to the dial rather than printed.

Column Wheel Chronograph Design

The Sinn 903 St HB Limited Edition features a column wheel chronograph construction developed by Manufacture La Joux-Perret and boasts an increased power reserve of 60 hours.  

Column Wheel
Most chronograph watches in production today are cam actuated, using two layers of metal to receive input from the pushers and transmit that input to the clutch. 

A column wheel chronograph uses a single part to perform both functions and is often compared to a castle's turret.  The column wheel is more difficult and labor intensive to manufacture than a cam actuated design and requires more skill and patience to complete.

The advantages of a column wheel design are a more precise feel and smoother operation of the chronograph pushers and functions.

Form and Function

The new Sinn 903 St HB Limited Edition, like its predecessors, was designed from the start to meet the needs of professional aviators.

The modified register placement aids in performance, while an internal slide rule ring provides additional data. This rotating inner ring with logarithmic scale divisions can be rotated externally without the need for an additional crown at 10.

The Sinn 903 St HB Limited Edition prioritizes clarity, functionality, and features essential for pilots. This focus on usefulness has shaped its iconic design.

Additionally, Sinn's desire for a clean and highly legible dial design led them to work with Manufacture La Joux-Perret to incorporate Calibre L112 into this limited edition which does not feature a date display (there is no "ghost date" crown position or date wheel under the dial).

Packaging and Presentation Box

Sinn PackagingThis new Sinn watch is packaged in a special presentation box and includes:

  • Sinn stainless steel fine link bracelet
  • Sinn light brown shell cordovan strap with tang buckle
  • Sinn spring bar tool
  • Additional spring bars

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.