Sinn 103 St Acrylic on Strap

Automatic winding chronograph in steel on strap
• Case diameter (mm): 41.0
• Case thickness (mm): 15.5
• Case lug width (mm): 20
• Weight - head only (grams): 74
• Case back: Solid
• Case finish: Polished
• Case metal: Stainless steel
• Dial color: Black
• Front crystal: Acrylic
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 2 years
• Warranty service: RGM or Sinn
° Earn 3480 WatchPoint Rewards on this purchase
WatchBuys Direct Price: $1,740.00
Availability: In Stock - Ships Immediately

Sinn 103 St Acrylic on Strap
Sinn 103 St Acrylic on Strap
Product Details

This is the classic Sinn pilot's chronograph featuring a bi-directional rotating light alloy aviation ring and black dial.

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

Case is in polished steel with solid case back. Other features include screw down crown with protective horns, domed acrylic crystal, screw in back and water resistance to 20 ATM.

Dial is matte black with Arabic numerals and luminous markers and hands. Strap is calf skin with Sinn tang buckle.

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

Sinn 103 st acrylic

"Sinn 103 st acrylic"

Sandeep S

Comments about this watch: Thanks watchbuys love the watch!!

I love my 103 St

"I love my 103 St"

Stephen G

Comments about this watch: My new Sinn 103 St is a beautiful and high quality watch. The domed acrylic crystal is a cool feature which adds a special dimension to the watch. I really love the friction bezel and may even prefer it over more modern click bezel systems.

I recommend this watch for anyone looking for a vintage style fleiger.

My New Vintage Chronograph

"My New Vintage Chronograph"


Comments about this watch: I have always wanted to own a true vintage chronograph from the era when it would have been a required tool for a professional. Since that means back in the 1960's then an acrylic crystal and a historic look would be required. There is really only a few choices if you want new and avoid the pitfalls of a 50 year old chronograph. Among them are an Omega Speedmaster or one of these Sinn 103's.

I went with the Sinn due to the auto movement, day-date, rotating bezel and water resistance of 200 meters. I was concerned with how the acrylic would take my daily wear usage, but after 7 months I have not found the need to do any kind of polishing. As for general wear, this watch hugs the wrist and because of the lighter acrylic stays planted on the wrist better than modern sapphire crystal watches.

Accuracy has been very good with a few second gain per day which I can count on and unlike a true vintage the lume glows like a torch! You can't go wrong with this Sinn 103 Acrylic.

Sinn 103 Acrylic

"Sinn 103 Acrylic"

Jonathan H

Comments about this watch: The 103 model with Acrylic is a great offering from Sinn. This is a chronograph that not only looks great, but works great as well. The top grade ETA Valjoux 7750 movement is amazing and is a must have in any collection.

Watchbuys made the purchasing process very easy, and the watch was delivered without any issue. Mine has been keeping perfect time, and has barely left my wrist since arriving!

Sinn 103 St

"Sinn 103 St"

Lars B.

Comments about this watch: This is a fantastic chronograph with great looks and the famous Sinn quality of manufacture. The dial is very legible both with time-keeping as well as chrono functions, and it has a cool 60s pilot look with the overall design and domed acrylic crystal. Lume is bright and long lasting. The Valjoux 7750 movement is rock-solid, accurate, reliable, and chronograph functions work smoothly.

This watch looks great with jeans and shirt, but the polished case also works for business settings. Overall, a fantastic watch and great value for the money.



Raymund C

Comments about this watch: This watch looks amazing and is probably worth more than its current price tag. I could not be happier with this purchase.

My new favorite

"My new favorite"


Comments about this watch: This is my second Sinn - and my new favorite watch in my collection.

The acrylic crystal lends a very nice vintage feel to this classic watch.  I'm also impressed with the lume and the high-quality and thick padded leather strap.

The watch wears beautifully.

Sinn 103 ST

"Sinn 103 ST"

Jeremy P

Comments about this watch: This is simply one of the best values in a pilot chronograph out there. Since I received mine it's been reliable and accurate.

I will definitely be getting another model from the 103 line.

Great Watch

"Great Watch"


Comments about this watch: This is truly a classic. Simple and sporty. Can be worn anywhere.

Very comfortable and practical. I highly recommend.

>> Read all watch reviews [] |  Write your own watch review


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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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