Tudor Black Bay GMT, 41mm steel case with polished and satin finish, domed opaline dial with a galvanic finish, bidirectional rotatable 48 notches bezel in steel with 24-hour graduated anodised aluminium disc in matt burgundy and blue, manufacture calibre MT5652 (COSC) self-winding mechanical movement with bidirectional rotor system built-in architecture, riveted steel bracelet with polished and satin finish with folding clasp and safety catch, domed sapphire crystal, waterproof to 200m (660 ft)