Tudor Black Bay One 31

Tudor Black Bay One 31, reference M79600-0004, has a 31 mm steel case with a polished and satin finish. The case is 9.5 mm thick with a 17 mm lug width, and the bezel is steel. Tudor rates the case to 100 metres. The movement is the self-winding calibre MT5201, a COSC chronometer with a power reserve of approximately 50 hours. A flat sapphire crystal covers the grey dial, which is set with diamonds. The crown is screw-down. The watch is fitted with a steel bracelet and a steel folding clasp.