TUDOR watch. Black Bay GMT S&G. 41 mm steel case with polished and satin finish. Riveted steel and yellow gold bracelet with polished and satin finish. Domed sapphire crystal. Black dial. 48-notch bidirectional rotating bezel in yellow gold with 24-hours graduated matt brown and black anodised aluminum disc. Manufacture Calibre MT5652 (COSC) Self-winding mechanical movement with bidirectional rotor system. Date. Approximately 70 hour power reserve.