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Four distinct dial variations exist, distinguished by the typography and the presence of a leap year indicator on later versions. A notable production rarity is the \"Senza Luna\" variant, which lacks a moon phase complication; one such example achieved a hammer price exceeding $1.1 million at a 2017 Christie’s auction."}, "listing_stats": {"count": 62, "median": 69750.0, "low": 33000.0, "high": 340000.0, "brands": 1, "merchants": 6}, "listings": [{"id": "h_7690293248209", "title": "Patek Philippe Patek Philippe Perpetual Calendar Chronograph 5270P-014", "brand": "Patek Philippe", "model": "Patek Philippe Perpetual Calendar Chronograph 5270P-014", "reference": "5270P-014", "price_usd": 178000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Platinum", "case_size_mm": 41.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/IMG_1955.jpg?v=1767993624", "detail_url": 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"detail_url": "https://mostexpensivewatches.net/listing/h_7404099698775", "buy_url": "https://mostexpensivewatches.net/out/h_7404099698775", "available": false}, {"id": "h_6978335244363", "title": "Patek Philippe Patek Philippe Perpetual Calendar 5270R", "brand": "Patek Philippe", "model": "Patek Philippe Perpetual Calendar 5270R", "reference": "5270R", "price_usd": 123300.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "hodinkee", "merchant_name": "Hodinkee Shop", "image_url": "https://cdn.shopify.com/s/files/1/0146/0732/files/Patek-Philippe-Grand-Complications-5270R-10-21-PTK-BAZ1Q5-f6f45dd57d2c.jpg?v=1711656098", "detail_url": "https://mostexpensivewatches.net/listing/h_6978335244363", "buy_url": "https://mostexpensivewatches.net/out/h_6978335244363", "available": false}], "auction_lots": [{"slug": "patek-philippe-3448-senza-luna", "brand": "Patek Philippe", "reference": "3448", "model": "Perpetual Calendar 'Senza Luna'", "case_material": "18k Yellow Gold", "hammer_usd": 2500000, "year_sold": 2023, "venue": "Christie's Geneva", "lot_summary": "A rare variant of the first automatic perpetual calendar by Patek Philippe, lacking the moonphase indicator. Only a handful of these 'Senza Luna' (without moon) examples were produced, often at the specific request of clients.", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-3448-senza-luna"}, {"slug": "patek-philippe-3448-2019", "brand": "Patek Philippe", "reference": "3448", "model": "Perpetual Calendar 'Padellone'", "case_material": "18k White Gold", "hammer_usd": 1155000, "year_sold": 2019, "venue": "Christie's New York", "lot_summary": "A rare white gold example of the first self-winding perpetual calendar wristwatch, featuring an integrated white gold bracelet.", "source_url": "https://www.christies.com/en/lot/lot-6210451", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-3448-2019"}, {"slug": "patek-philippe-3448-14-2020", "brand": "Patek Philippe", "reference": "3448/14", "model": "Perpetual Calendar Gübelin", "case_material": "18k White Gold", "hammer_usd": 483750, "year_sold": 2020, "venue": "Phillips Hong Kong", "lot_summary": "A white gold perpetual calendar with an integrated bracelet, signed and sold by the Swiss retailer Gübelin.", "source_url": "https://www.phillips.com/detail/patek-philippe/HK080120/1000", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-3448-14-2020"}]}