Sinn 857 UTC VFR Tegimented on Bracelet

DIN 8330 certified professional pilot's watch
• Case diameter (mm): 43.0
• Case thickness (mm): 12.0
• Case lug width (mm): 22
• Weight - head only (grams): 90
• Case back: Solid
• Case finish: Matte
• Case metal: Tegimented hardened steel
• Dial color: Black
• Front crystal: Sapphire
• DIN 8330 certified: Yes
• Tegimented: Fully
• Inert gas: Filled
• Copper sulphate: Capsule
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 3 years
• Warranty service: RGM or Sinn
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WatchBuys Direct Price: $2,630.00
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Sinn 857 UTC VFR Tegimented on Bracelet
Product Details

New Sinn DIN 8330 Tegimented Dual Time Zone UTC

This is a brand new release from Sinn, and is one of the world's first watches to meet the new DIN 8330 standards for professional pilot's watches.

The new Sinn 857 UTC VFR is one of the first pilot watches in the world to be distinguished by precisely defined functional and technical features to withstand vibrations, shock loads, centrifugal force loads, temperature changes and magnetic fields occurring in flight.

These tests ensure that the 857 UTC VFR can act as an all-round replacement for the on-board timekeeping instruments available to pilots under visual flight rules (VFR).

This watch is also capable of tracking two times zones through the use of a second hour hand on a 24 hour scale for indication of AM and PM. 

The range of technologies also includes Sinn's Dry Hold technology for greater functional reliability and freedom from fogging and overall functional reliability at temperatures between 45 C and + 80 C.

Take a look at these specs, and we think you will agree this watch sets a new standard for pilot's watches:

  • Tested and certified to DIN 8330
  • UTC function to track two time zones
  • Case made of Tegimented steel
  • Dehumidifying technology enhances functional reliability and freedom from fogging
  • Functionally reliable from 45 C up to + 80 C
  • Captive pilot's bezel with minute ratcheting
  • Sapphire crystal glass
  • Water resistant to 200 meters
  • Low pressure resistant

Dial is matte black with Arabic numerals and dual color luminous markers and hands.

This watch is equipped with a Sinn Tegimented steel bracelet with locking clasp.

DIN 8330 is the New Standard for Pilot's Watches

German DIN (Deutsches Institut fur Normung) standards command a high level of respect both nationally and internationally, and represent the very highest level of quality and precision.

Watch companies in both Germany and Switzerland strive to meet the many DIN standards which govern everything from magnetism to shock resistance to water resistance.

But until now, there has been no DIN standard for what constitutes a "pilot's watch" or what tests a pilot's watch needs to pass.


Welcome to that new standard - DIN 8330 Horology - Aviator Watches, which officially took effect in March, 2016.

The new DIN 8330 sets a new benchmark for safe, functional and reliable pilot watches. Watches certified in accordance with DIN 8330 are designed to fully assume the functions of the instruments for time measurement in aircraft and helicopters in the event of outages or suspected failures.

This means that pilot watches must meet certain requirements in terms of functionality and reliability, resistance to external stresses, safety and compatibility.

As a long-established manufacturer of pilot watches, Sinn took the initiative and played a key role in promoting the development of a recognized DIN standard - the first new German watch standard in decades.

This project began with the TESTAF technical standard for pilot watches developed by Sinn in collaboration with the Department of Aerospace Technology at Aachen University of Applied Sciences which was presented to the public in 2012.

Building on this standard with the broad participation of the German watchmaking industry, the new DIN 8330 was developed over a period of several years by users, testing institutes and scientists.

These partners included Sinn, Stowa, Glashutte Original, Aachen University of Applied Sciences, Lufthansa Cargo, Airbus Helicopters, and DNV GL among others.

The DIN 8330 Requirements

DIN 8330 defines what a pilot's watch must be able to do and DIN 8330which stresses it must be able to withstand. This includes fast, clear readability of the dial both during the day and at night, the ability to operate the watch even while wearing pilot gloves and accuracy not only at room temperature but also at ranges of between -15 degrees and 55 degrees Celsius.

The DIN tests to determine physical resilience include not only a simple low-pressure test, but also a several-thousandfold pressure change cycle which simulates the stresses on the watch caused by changes in pressure during take-off and landing of an aircraft in daily long-haul operation.

Resistance to liquids typically found in aircraft (fuel, lubricants, cleaning fluid and de-icing fluid) not only guarantees safety during flight operations but also provides additional protection on the ground.

A DIN certified pilot watch must also be able to withstand clearly defined vibrations, impact and centrifugal force loads, temperature changes and, not least, magnetic fields. The complete watch must prove that it meets the requirements even when placed under these various physical stresses.

The safety features of a DIN compliant pilot watch include a particularly secure strap fastening and the required compatibility with night vision equipment. Light reflections that could distract or dazzle the pilot are minimized, and the possibility of any interference with the plane's avionics and emergency compass is eliminated through tests at a specially developed test facility.

All this means that watches certified in accordance with DIN 8330 not only ensure better safety in the air but also increased suitability for everyday use, going far beyond the shock-resistant and water resistant characteristics of today's standard watches.

The DIN Certification Mark

Only watches which pass the strict set of tests outlined in DIN 8330 may use this designation on the watch.

The special quality standards that apply to a DIN 8330 certified pilot watch can be seen at every stage of its manufacture, from the selection of high quality materials to production processes where special care is always taken and ultra-narrow tolerances apply.

The certification process carried out by a neutral institution in accordance with DIN/ISO 17065 and 17067. Only then can the watch be furnished with the new DIN 8330 certification mark.

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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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