The Royal Oak 15550ST.OO.1356ST.07 is one of the core 37 mm models in Audemars Piguet's modern Royal Oak collection. Introduced in 2022, it features a stainless-steel case and bracelet, a grey "Grande Tapisserie" dial, and the in-house Calibre 5900 automatic movement. It represents the updated Royal Oak generation that succeeded the earlier 15450 reference.