The Audemars Piguet Royal Oak "Jumbo" Extra-Thin "50ᵀᴴ Anniversary" 39mm (ref. 16202BA.OO.1240BA.01) is an automatic sport watch, with a 39mm 18-carat yellow gold case, powered by the 7121 movement and a 52-hour power reserve. Water resistance is rated to 50m, under a sapphire crystal.