Sinn 857

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Template:File Model 857 (and similar EZM 7) is an instrument watch by Sinn produced since 2007.


Sinn introduced the model 857 as an update to the Sinn 657. It features a larger 43 mm case (up from 41 mm), TEGIMENT case, and Ar-Dehumidifying technology. As was the case with the 657/656, a smaller version with a fixed bezel is also produced, the Sinn 856. But the 857 has a bi-directional movable pilot's bezel. The watch is magnetic field protected.

Sinn also produced UTC versions, which allow a second timezone to be read using a movable central hour hand.


In 2010, Sinn created the EZM 7, a Mission Timer for fire brigades. Essentially identical to the existing Sinn 857, the EZM 7 rotates the case 180 degrees so the crown is on the left side of the dial. The inner portion of the dial features scales measuring important aspects of firefighting. An EZM 7 S was added as well.


See Also: Sinn 856
  • 857 (2007-present)
  • 857 S (2009-present)
  • 857 S UTC (2011-present)
  • 857 UTC (2011-present)
  • 857 UTC TESTAF (2013-2017)
  • 857 UTC TESTAF LH Cargo (2014-present)
  • 857 UTC VFR (2017-present)


Mechanical movement (ETA 2893-2), 28,800 A/h
Nivarox 1 hairspring, Glucydur balance wheel, Beryllium plateau
Mainspring Nivaflex 1, Incabloc shock absorber


Tegimented stainless steel case, bead-blasted
Ø 43.0 mm, height 12.2 mm
Pilot's bezel : stainless steel, hardened with Tegiment technology, captive, bidirectional rotating and latching in minute intervals; black anodized aluminum ring with luminous triangle
Nickel-free caseback
Sapphire crystal with anti-glare treatment on both sides
Screw-in crown with double o-ring gasket
Magnetic field protection up to 80.000 A/m
Waterproof to 200 m
Safe below atmospheric pressure


Hours, minutes, seconds, date
Dual time zone on 24 hours basis


Black, indexes and numerals with special white, long-lasting luminous paint
Internal 24 hours scalein white
UTC letters in daylight color, UTC hands with daylight color


Cowhide leather strap
Variants: Solid stainless steel bracelet, tegimented and black hard-coated


Production: 2007-Present
Predecessor: Sinn 657