APS Audeube Royal Oak Offshore 15407ST.OO.1220ST.01 Men's mechanical watch Calibre 3132 Integrated movement, 41mm diameter, 9.9mm thickness Dark grey dial Shape: Round dial Material: Hollow dial, with rose gold fluorescent chronograph and Royal Oak pointer mirror Material: Anti-glare treatment sapphire crystal glass mirror Crown Material: steel, screw crown back transparent: back transparent, anti-glare sapphire glass mirror