Tudor Black Bay One 31

The Tudor Black Bay One 31, reference M79600-0006, comes in a 31mm steel case with a polished and satin finish. The case measures 9.5mm thick and carries a flat sapphire crystal over the light champagne dial. Eight diamonds are set into the dial, and the hands and indices carry luminous treatment for visibility in low light. A screw-down crown, marked with the Tudor rose, seals the case. Inside is the self-winding manufacture calibre MT5201, a chronometer-certified movement with about 50 hours of power reserve and a central seconds display. The watch is fitted to a steel bracelet with a folding "T-fit" clasp and safety catch. Tudor rates the case to 100 metres of water resistance.