Audemars Piguet Royal Oak Perpetual Calendar Openworked

About this reference

The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25829TP was produced from the late 1990s through the mid-2010s. Collectors prioritize this reference for its rare bi-metal construction, combining a tantalum case and bracelet links with a 950 platinum bezel and center links. The 39mm "Jumbo" case houses the ultra-thin self-winding caliber 2120/2802, visible through a sapphire dial that displays the perpetual calendar functions without obscuring the skeletonized movement. Production numbers for the TP variant are significantly lower than the steel or gold versions, with estimates suggesting fewer than 100 units were manufactured. On the secondary market, this reference typically commands prices in the mid-to-high six-figure range, often exceeding $400,000 depending on provenance. A notable 2023 auction result at Phillips saw a well-preserved example achieve approximately $480,000, reflecting the high demand for tantalum Royal Oaks among specialized collectors.