TUDOR Black Bay Chrono

41 mm steel case, Black leather bracelet, 41 mm steel case with polished and satin finish, Fixed 316L steel bezel with matt black anodised aluminium disc with tachymetric scale and silver markings, Manufacture Calibre MT5813 (COSC) Self-winding mechanical movement with bidirectional rotor system, Opaline with black counters, domed, 316L steel screw-down pushers at 2 o'clock and 4 o'clock, Domed sapphire crystal, Waterproof to 200 m (660 ft), Black leather strap with removable bund with folding clasp and safety catch.