Available NEW at Chronomaster from £1890.00

Sinn 857 Testaf on Tegimented Bracelet SIN 235
  • Case MaterialSteel
  • ConditionBrand New
  • MovementAutomatic


The 857 UTC TESTAF was tested and certified to the the “Technical Standard for Pilot Watches” (Technischer Standard Fliegeruhren – TESTAF) by the Aachen University of Applied Sciences. This establishes its suitability for professional use as a pilot watch. It is attested to by a certificate and the "TESTAF" quality seal on the dial.
The case of the 857 UTC TESTAF has been hardened with TEGIMENT Technology to make it especially scratch-resistant. The range of technologies also includes Ar-Dehumidifying Technology for greater functional reliability and freedom from fogging and overall functional reliability at temperatures between –45°C and +80°C. The 857 UTC TESTAF features a further time measurement element: a display for a second time zone on a 24-hour basis.


Mechanical Movement

  • ETA 2893-2
  • Self-winding mechanism
  • 21 bearing jewels
  • 28,800 semi-oscillations per hour
  • Seconds stop function
  • Shock resistant as per DIN 8308
  • Anti-magnetic as per DIN 8309



  • Case made of stainless steel, bead-blasted
  • Sapphire crystal glass in front, anti-reflective on both sides
  • Case back screw-fastened
  • Crown screwable
  • Meet the technical requirements for waterproofness, as set out in standard DIN 8310
  • Pressure-resistant up to 20 bar (= 200 m water depth)
  • Low pressure resistant



  • Hours, minutes, seconds
  • Second time zone on a 24-hour basis
  • Date display
  • Pilot’s bezel with minute ratcheting and luminous key mark


Sinn Technologies

  • TEGIMENT Technology, therefore especially scratch-resistant
  • Captive bezel
  • Ar-Dehumidifying Technology enhances functional reliability and freedom from fogging
  • Temperature resistance technology, therefore functionally reliable at temperatures from minus 45°C up to 80°C


Dimensions and Weight

  • Case diameter: 43 mm
  • Band lug width: 22 mm
  • Case thickness: 12 mm
  • Weight without strap: 90 gramme


Dial and Hands

  • Matte black dial
  • Numbers and indices coated with luminescent colour
  • Hour, minute and second hand coated with luminescent colour



  • 3 years
+ More
Sinn 857 Testaf on Tegimented Bracelet - SIN 235
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