Sinn Spezialuhren 917 GR

The Sinn 917 GR, reference 917.010, is a chronograph with a 44 mm polished steel case water resistant to 100 metres. The 15.5 mm thick case has a see-through back and a screw-down crown. A fuel-gauge-shaped power reserve indicator is set into the dial. Small seconds and a date are visible through the anti-reflective sapphire crystal. Around the dial, a rotating bezel carries a countdown scale. The movement is calibre Valjoux 7750 with self-winding. Ar-Dehumidifying Technology combats crystal fogging and slows lubricant ageing.