Audemars Piguet Royal Oak Perpetual Calendar

About this reference

The Audemars Piguet Royal Oak Perpetual Calendar reference 25820PT was produced from the late 1990s through approximately 2012. This reference is constructed from 950 platinum, featuring a 39mm "Jumbo" case profile and an integrated bracelet. It utilizes the self-winding caliber 2120/2802, which is based on the ultra-thin Jaeger-LeCoultre 920 movement. Collectors prioritize this reference for its leap-year indicator on the dial—a feature absent from its predecessor, the 25721—and its traditional 39mm proportions. The platinum variant is significantly heavier and rarer than the steel or gold versions, often featuring a smooth "Tuscan" or a classic "Petite Tapisserie" dial. Current secondary market prices typically fall within the $150,000 to $250,000 range depending on dial configuration and condition. A notable production detail is the transition from solid casebacks to sapphire display backs during the mid-2000s, which impacts collector preference and value.