Tudor Black Bay One 31

Tudor Black Bay One 31, reference M79600-0006, has a 31 mm steel case. The case is 9.5 mm thick with a 17 mm lug width. The bezel is steel, with a polished and satin finish. Calibre MT5201 is a self-winding chronometer movement, COSC certified and tuned to -3/+5 seconds, with a power reserve of approximately 50 hours. A flat sapphire crystal covers the champagne dial, which is set with diamonds. The watch has a screw-down crown. The case carries a 100 metre rating. A steel bracelet with a steel folding clasp is fitted to the watch.