Audemars Piguet Royal Oak Skeletonized Perpetual Calendar

About this reference

The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25829BA was produced from approximately the mid-1990s until the early 2010s. This reference is constructed in 18k yellow gold with a 39mm case diameter and a thickness of 9.3mm, maintaining the "Jumbo" proportions favored by collectors. It features the ultra-thin self-winding caliber 2120/2802, which is visible through the sapphire dial and exhibition caseback. The movement is hand-finished with extensive skeletonization and engraving on the bridges and the 21k gold rotor. Collectors value this reference for its bridge between traditional finishing and the integrated bracelet design. On the secondary market, prices typically range from $250,000 to $350,000 depending on the presence of original accessories. Production was limited, with approximately 424 units estimated to have been produced in yellow gold. A notable 2023 auction result at Phillips reached approximately $241,000 for a 1997 example.