Tudor Black Bay GMT S&G, 41mm steel case with polished and satin finish, black, domed, 48-notch bidirectional rotating bezel in steel core covered by a 0.3mm 18 ct yellow gold cap, 24-hour graduated matt brown and black anodised aluminium disc, manufacture calibre MT5652 (COSC) self-winding mechanical movement with bidirectional rotor system built-in architecture, brown leather strap with steel folding clasp and safety catch, domed sapphire crystal, waterproof to 200m (660 ft)