Audemars Piguet Royal Oak Automatic 41mm 15400ST 2016 [Preowned]Overview The Audemars Piguet Royal Oak reference 15400ST represents a pivotal chapter in the evolution of the worlds first luxury sports watch. Introduced in 2012 as the successor to the 39mm ref. 15300, the 15400ST brought a bolder, more contemporary 41mm footprint to the collection while meticulously preserving the design principles established by Grald Genta in 1972. Produced until 2019, this reference has become a modern anchor for the