Crafted in 925 sterling silver with an open case back for a truly unique design, the new TUDOR Black Bay Fifty-Eight 925 Men\'s Watch boasts two firsts for a TUDOR diver\'s watch. Both vintage-inspired and perfectly slim, this timepiece is a must-have. At A Glance  Presented on a taupe fabric strap with silver band and 925 sterling silver buckle 39mm 925 sterling silver case with satin finish Unidirectional rotatable bezel in 925 sterling silver with 60-minute graduated disc in matt taupe anodised aluminium and silver gilded markings and numerals 925 sterling silver screw down winding crown with the TUDOR rose in relief with circular satin-brushed 925 sterling silver winding crown tube Matt frosted taupe dial with applied hour markers “Snowflake” hands, one of the hallmarks of the TUDOR divers’ watches introduced in 1969, with grade A, Swiss Super-LumiNova® luminescent material Waterproof to 200m Scratch resistant domed sapphire crystal Powered by the self-winding mechanical movement with bi-directional rotor system, Calibre MT5400 Power reserve of 70 hours Swiss chronometer officially certified by COSC