Sinn 203 TiAr
The Sinn Ref. 203 series are dive watches with automatic chronograph movements. They are water and pressure resistant to 30 bar (300 m) and also shock- and magnetic-resistant to DIN 8306 specifications.
The Sinn 203 Ti Ar was the first model to feature Sinn's Ar-Dehumidifying technology on launch in 1995. The 203 ARKTIS was used in the Arctic Sea in 1999, proving its temperature and vibration hardiness.