====== Sinn 857 ======
{{wst>image_cr|Sinn|857}}

Model **857** (and similar **EZM 7**) is an instrument watch by [[Sinn]] produced since [[2007]].

===== Overview =====
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/[[Sinn 656|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.

===== EZM 7 =====
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.

===== References =====
  *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)


<WRAP ud ud_mod>

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

**Case:**
  * 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
  * 
  * **Functions **
  * Hours, minutes, seconds, date
  * [[Dual time zone]] on 24 hours basis

**Dial:**
  * 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

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

**Production: **
  * Production [[2007]]-Present
  * Predecessor [[Sinn 657]]
</WRAP>

{{tag>Watch_models Sinn_Pilot's_Watch_models}}