{"query": "1527", "brand": null, "total": 1, "limit": 10, "matches": [{"slug": "patek-philippe-1527", "brand": "Patek Philippe", "ref": "1527", "model": "Perpetual Calendar Chronograph", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/patek-philippe-1527", "description": "The Patek Philippe Reference 1527 was produced between 1940 and 1944, with only two known examples featuring the perpetual calendar chronograph complication. This specific 18k yellow gold reference is a precursor to the 2499, utilizing a 37.6mm case that was considered oversized for the era. It houses the Valjoux-based caliber 13''' movement and features a dial with a tachymeter scale, moon phase aperture, and date sub-dial. Collectors value this reference for its historical role as a unique prototype that defined the aesthetic of Patek Philippe’s mid-century complicated watches. Due to its extreme rarity, the watch does not have a standard secondary market bracket, though it commands high-seven-figure prices at auction. In 2010, this specific yellow gold perpetual calendar chronograph sold at Christie’s for approximately $5.7 million, establishing it as one of the most expensive vintage wristwatches ever sold.", "score": 199}]}