The Audemars Piguet Royal Oak Double Balance Wheel Openworked reference 15407ST.OO.1220ST.02 is a 41mm luxury timepiece that combines a stainless steel case and integrated bracelet with a striking salmon-toned skeletonized movement. This model features the iconic octagonal bezel with eight hexagonal screws and a case thickness of 9.9mm. The openworked dial architecture showcases a pink gold-toned inner bezel, white gold applied hour markers, and luminescent Royal Oak hands, providing a contemporary two-tone aesthetic while offering a water resistance of 50 meters.
The watch is powered by the in-house self-winding caliber 3132, which is notable for its patented double balance wheel mechanism. This technical complication features two balance wheels and two hairsprings assembled on the same axis to significantly improve chronometric precision and stability by canceling out positional errors. The movement consists of 245 parts, operates at a frequency of 3 Hz, and provides a power reserve of approximately 45 hours. Its functions are dedicated to essential timekeeping, including hours, minutes, and center seconds.
General reviews of this reference emphasize its status as a masterwork of openworking, highlighting how the salmon-colored bridges create a warm, high-contrast look against the industrial steel case. Collectors frequently praise the caliber 3132 for its visual depth and the mechanical advantage it offers over single balance wheel movements. While the watch is celebrated for its technical sophistication and wearability, its extreme rarity and high demand in the secondary market are often noted as significant barriers for prospective owners.