Audemars Piguet Royal Oak Double Balance Wheel Openwork/ Stainless Steel/ Skeleton Dial (Ref#15407ST.OO.1220ST.01)

The Royal Oak 15407 was introduced at SIHH 2016. It features an open-worked movement with two superimposed balance wheels in the typical Royal Oak case with dimensions similar to that of the 2015 15400.
Royal Oak Double Balance Wheel Openwork 41mm Skeleton-
Self-winding watch with date display. 41mm stainless steel case, slate grey open-worked dial, 18-carat pink gold applied hour markers, Royal Oak hands with luminescent coating, stainless steel bracelet. Water-resistant up to 50 meters.