TUDOR watch. Black Bay Chrono S&G. 41 mm steel case with polished and satin finish. Brown leather with removable bund, with folding clasp and safety catch. Domed sapphire crystal. Champagne dial. Fixed yellow gold bezel with matt black anodized aluminium disc with tachymetric scale, yellow gold markings. Manufacture Calibre MT5813 (COSC) Self-winding mechanical movement with bidirectional rotor system. Date. Approximately 70 hour power reserve.