Audemars Piguet Selfwinding

Audemars Piguet's Royal Oak Selfwinding 15513BA.OO.1320BA.01 is a 41 mm case in 18-carat yellow gold. It measures 10.5 mm thick and pairs the gold case with a green dial. A sapphire crystal covers the dial, which carries hours, minutes and a centre seconds display. The self-winding movement is AP's calibre 4309. The gold bracelet is integrated into the case and closes with a three-blade folding clasp. Green here refers to the dial's natural stone finish rather than a lacquered surface. The case is rated to 50 metres of water resistance.