The 857 series consists of pilot watches and has been built upon the successful 856 Sinn range. This watch comes with ETA 2893-2 automatic calibre. It performs 28 800 vibrations per hour and has 21 bearing jewels. The timepiece features extreme protection from magnetic fields, as well as high and low pressure resistance. Additional features include Sinn’s dehumidifying technology, a second time zone on a 24-hour basis, captive pilot’s bezel with minute ratcheting and scratch-resistant sapphire crystal glass with anti-reflective coating on both sides.