This self winding Audemars Piguet Royal Oak 26331BA.OO.1220BA.01 has a 41 mm case that is 11 mm in height and is crafted from 18 ct yellow gold. With glare-proofed sapphire crystal and screw locked crown. The blue dial with "Grande Tapisserie" pattern, features yellow gold-toned counters and yellow gold applied hour-markers and Royal Oak hands with luminescent coating. Complimented by a 18 ct yellow gold bracelet and secured with AP folding clasp. This AP Royal Oak Chronograph is powered by the self-winding in-house calibre 2385. This automatic movement provides a power reserve of at least 40 hours. Functions include chronograph, hours, minutes, small seconds and date. It is water resistant up to 50 Meters.