The Audemars Piguet Royal Oak Double Balance Wheel Openworked reference 15407ST.OO.1220ST.01 is a 41mm luxury sports watch crafted from stainless steel. This model features the collection’s hallmark octagonal bezel with eight hexagonal screws and an integrated bracelet with a mix of satin-brushed and polished finishes. It is notably slim with a thickness of 9.9mm and provides a water resistance of 50 meters. The openworked slate grey dial showcases the intricate inner workings of the movement, complemented by pink gold applied hour markers and Royal Oak hands with luminescent coating for enhanced legibility.
The watch is powered by the self-winding Manufacture Calibre 3132, which is distinguished by its patented double balance wheel mechanism. By incorporating two balance wheels and two hairsprings on the same axis, the movement achieves significantly greater precision and stability. This technical innovation consists of 245 parts and 38 jewels, operating at a frequency of 3 Hz and providing a 45-hour power reserve. The complications are kept elegant and functional, focusing on hours, minutes, and center seconds to allow the complex architecture of the skeletonized movement to remain the primary visual focus.
General reviews of the 15407ST frequently praise it as a masterpiece of modern horology that successfully blends technical ingenuity with iconic design. Critics and collectors alike highlight the exceptional level of hand-finishing on the movement bridges, specifically the polished bevels and straight-grained surfaces that are only achievable through high-level craftsmanship. The watch is often described as a significant upgrade over previous skeletonized models due to the improved chronometric performance offered by the double balance system. While its aesthetic is bold and contemporary, it remains highly regarded for maintaining the classic proportions and wearability that have defined the Royal Oak since its inception.