{"query": "25636BA", "brand": null, "total": 1, "limit": 10, "matches": [{"slug": "audemars-piguet-25636ba", "brand": "Audemars Piguet", "ref": "25636BA", "model": "Royal Oak Skeletonized Perpetual Calendar", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25636ba", "description": "Produced between approximately 1986 and the mid-1990s, the Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25636BA is a significant neo-vintage reference housed in a 39mm 18k yellow gold case. Collectors prioritize this model for its ultra-thin self-winding caliber 2120/2800, which lacks a leap year indicator, a characteristic of early perpetual calendar movements. The sapphire dial reveals the hand-finished skeletonized components, while the absence of a sapphire caseback on many early examples distinguishes it from later iterations. Total production for the 25636BA is estimated at 126 units, making it rarer than its non-skeletonized counterparts. On the secondary market, prices typically occupy the mid-to-high six-figure range, depending on the presence of the original box and papers. A notable auction result occurred in 2022 when a well-preserved example sold for over $400,000, reflecting the high demand for early openworked Royal Oaks.", "score": 202}]}