TUDOR Black Bay 58 18K

39mm yellow gold case, Brown alligator bracelet CASE: 39mm case, satin finished, in 18 kt yellow gold Open case back with sapphire crystal BEZEL: Unidirectional rotatable bezel in 18 kt yellow gold with 60-minute graduated disc in matte green anodized aluminum and gold gilded markings and numerals MOVEMENT: Manufacture Caliber MT5400 (COSC) Self-winding mechanical movement with bidirectional rotor system DIAL: Green, domed WINDING CROWN: 18 kt yellow gold screw-down winding crown, with the TUDOR rose in relief with circular satin-brushed 18 kt yellow gold winding crown tube CRYSTAL: Domed sapphire crystal WATERPROOFNESS: Waterproof to 200m (660 ft) BRACELET: Domed dark brown alligator strap with 18 kt yellow gold buckle