The Audemars Piguet Royal Oak Selfwinding Chronograph (Ref. 26240ST.OO.1320ST.05) is a 41 mm stainless steel timepiece that embodies the latest evolution of the Royal Oak design. It features a "Bleu Nuit, Nuage 50" Grande Tapisserie dial, complemented by white gold applied hour-markers and Royal Oak hands with luminescent coating. The watch is powered by the self-winding Caliber 4401 movement, offering a 70-hour power reserve. The stainless steel bracelet is secured with an AP folding clasp.