Audemars Piguet Royal Oak Automatic 41mm 15500ST 2021 [Preowned]Overview The Audemars Piguet Royal Oak reference 15500ST represents a definitive modern evolution of the most influential watch design of the 20th century. Introduced in 2019 to succeed the 15400, this reference recalibrated the Royal Oak formula for a new era, offering a bolder, more technical execution while honoring the "Grammar of Design" established by Grald Genta in 1972. It stands as a pivotal model in the AP cataloga timepiece that feels