SINN 857 UTC Tegimented Steel GMT Swiss Automatic 43mm Tegimented Steel Bracelet


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We take trades against any of our watches!!! We also buy watch packages!!

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.

To create this watch, Sinn built on the extremely popular design of the Sinn 856 UTC dual time zone watch and a new case size and bezel. 
On a frequent basis we receive client praise for Sinn’s “Tegiment” (hardening) technology, and have heard quite a few stories of watch cases scraped against metal railings, car doors, metal desks, and other more interesting objects with little to no damage to the case. 

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 layer has a hardness of 1,200 Vickers which is up to five times harder than standard steel.

The Tegiment layer 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 even further improved by the Tegiment hardening process.

The case back is nickel free, perfect for those with allergic reactions to case metals. Other features include protection from magnetic fields of up to 80,000 A/m, sapphire crystal with anti-reflective coating on both sides.

Another Sinn engineering feat is the creation of a bezel that is secured by screws.  The inlaid aluminum ring featuring numerals and markers is anodized black for optimal legibility, while the triangle reference marker at 12 is applied with special paint for visibility.

The case features a copper sulphate capsule which reacts with moisture to diffuse and absorb humidity in the watch. This capsule may be viewed through a porthole in the left lug, and over time will turn a deep blue as humidity is absorbed. This technology not only provides a more stable environment for the movement, but also helps to prevent fogging of the crystal when going from hot to cold environments or from humid to non-humid conditions (such air conditioned buildings).

This watch has a second time zone displayed by a skeleton yellow tipped hour hand. The second time zone can be set directly through the second position of the crown and uses a 24 hour indication to differentiate AM and PM.

Sand-blasted stainless steel case with solid back. Dial is matte black with Arabic numerals and offset date display at 4. The design and layout of this watch make it extremely easy to read in virtually all light conditions.

Sapphire crystal with luminous hands, hour markers and the 12. Watch is water resistant to 20 ATM. Watch is fitted with a Tegimented steel bracelet with hex screws and solid end links.

Other features include Sinn’s Dehumidification Technology which uses inert gas to reduce humidity and to prevent the dial from fogging.


MODEL: 857 UTC Tegimented

MOVEMENT: Swiss Automatic

CASE: Tegimented Steel

CROWN: Screw Down crown

SIZE: 43mm

LUGS: 22mm

DIAL: Black Dial

BEZEL: Tegimented Steel Rotating Bezel 

CONDITION: Pre-owned – As-New Factory Warranty through Sept 2022!

BOXES/PAPERS: 100% Complete Set – Everything as shown in pictures!


STRAP/BRACELET: – Original Sinn Tegimented Steel Bracelet with all links and with folding deployment clasp.

We buy similar watches…large packages as well as one at a time. We also take trades against any of our watches…

Let us know what you have in your collection!! I consider all watches in trade! Please upload pictures and include details of your trades through my Trade/Buy tab at the top of my homepage.