Sinn Spezialuhren 857 S

The Sinn 857 S, reference 857.021, is a watch whose 43 mm steel case is water resistant to 200 metres. Black Hard Coating lies over a TEGIMENT-hardened base on the 12 mm thick case. A screw-down crown sits beside the captive rotating pilot's bezel. The bezel ratchets in minute steps. Sapphire crystal reveals a matte black dial with central seconds and a date window. Self-winding calibre SW300-1 has an anti-magnetic movement construction. Ar-Dehumidifying Technology combats fogging.