TUDOR Black Bay 31 S&G

31mm 316L steel case with polished and satin finish. Waterproof to 100m (330 ft )Fixed bezel in steel covered by a 0.3mm 18 ct yellow gold cap. Black dial with diamond hour markers. Sapphire crystal.Manufacture Calibre MT5201 (COSC) Self-winding mechanical movement with bidirectional rotor system Integrated construction. Power reserve of approximately 50 hours. Screw-down winding crown with the TUDOR rose in relief. Steel covered by a 0.1mm 18 ct yellow gold cap. Yellow gold center links at 6 and 12 o’clock. Remaining center links in steel covered by a 0.2mm 18 ct yellow gold cap. "T-fit" folding clasp with safety catch. The logo on the catch is made of yellow gold