Sinn Spezialuhren 157 St Ty

The Sinn 157 St Ty, reference 157.020, is a chronograph in a 40 mm steel case water resistant to 200 metres. The bead-blasted case is 15 mm thick and has a screw-down crown. A sapphire crystal fronts the matte black dial with date, weekday and small seconds indications. The self-winding calibre Lemania 5100 is shock resistant. A tachymeter scale frames the display, with tritium luminous paint on the indices and hour and minute hands.