Tudor Black Bay One 31

Tudor Black Bay One 31, reference M79600-0003, has a 31 mm steel case with a polished and satin finish. The case is 9.5 mm thick, the lug width is 17 mm, and the bezel is steel. The watch runs on calibre MT5201, a self-winding movement with a power reserve of approximately 50 hours. The calibre is tuned to -3/+5 seconds, and the watch is a chronometer. A flat sapphire crystal covers the champagne dial. The crown is a screw-down type, and the case carries a 100 metre rating. A steel bracelet is fitted, with a steel folding clasp.