Sinn watches

Sinn was founded in Frankfurt am Main in 1961 by Helmut Sinn, a former pilot and blind-flying instructor, as Helmut Sinn Spezialuhren. On 1 September 1994 the engineer Lothar Schmidt, previously of IWC, acquired the company and renamed it Sinn Spezialuhren GmbH. Since 2017 it has been based in new headquarters in Frankfurt-Sossenheim, where watches are produced and serviced. Helmut Sinn died in 2018.

After its foundation the company concentrated on navigation cockpit clocks and pilot chronographs. The Ar-Dehumidifying Technology, introduced in 1998 in the 203 Ti Ar diver, uses a drying capsule and protective gas to slow oil ageing. Tegiment, a surface-hardening process, was first used in 2003 on the Duochronograph 756. In 2005 German submarine steel was used for the first time in the cases of the U-series divers. The EZM mission timers began in 1997 with the EZM 1 and EZM 2. A Sinn 140 S chronograph was worn by Reinhard Furrer on the Spacelab D1 mission in 1985.