31 mm 316L steel case with polished and satin finish Manufacture Calibre MT5201 (COSC) Self-winding mechanical movement with bidirectional rotor system Integrated construction Power reserve of approximately 50 hours Yellow gold screw-down winding crown with the TUDOR rose in relief Waterproof to 100 m (330 ft) Fixed bezel in yellow gold black dial Flat sapphire crystal Steel and yellow gold bracelet, polished and satin finish, with steel “T-fit” folding clasp and safety catch