{"reference": {"slug": "audemars-piguet-25829tr", "brand": "Audemars Piguet", "ref": "25829TR", "model": "Royal Oak Perpetual Calendar Openworked", "case_material": "Tantalum and 18k Pink Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25829tr", "description": "The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25829TR was produced from the late 1990s through the mid-2010s. This reference is distinguished by its bi-metal construction, pairing a tantalum case and outer bracelet links with 18k pink gold bezels and center links. Collectors prioritize this model for its skeletonized caliber 2120/2802, an ultra-thin automatic movement visible through the sapphire dial and exhibition caseback. The use of tantalum, a dense and difficult-to-machine refractory metal, makes this variant significantly rarer than standard steel or gold iterations. Current secondary market valuations typically fall within the $250,000 to $400,000 range depending on condition and provenance. Production records suggest that fewer than 100 units of the 25829TR were manufactured, and a notable example sold at a Phillips auction in 2021 for approximately 302,000 CHF, confirming its status as a low-volume collector piece."}, "lang": "en", "url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25829tr", "reference_url": "https://mostexpensivewatches.net/reference/audemars-piguet-25829tr", "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25829tr", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "auction_comp_count": 1, "alternatives": [{"reference": {"slug": "audemars-piguet-25654ba", "brand": "Audemars Piguet", "ref": "25654BA", "model": "Royal Oak Perpetual Calendar", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25654ba", "description": "Produced between 1982 and 1993, the Audemars Piguet Royal Oak Perpetual Calendar reference 25654BA represents an early evolution of the ultra-thin perpetual calendar complication within the Royal Oak line. Collectors prioritize this reference for its 39mm \"Jumbo\" case proportions and the caliber 2120/2800, a movement derived from a Jaeger-LeCoultre base that allowed for a case thickness of approximately 8.2mm. Unlike modern iterations, the 25654BA lacks a leap year indicator on the dial, a characteristic of early AP perpetual calendars. Approximately 422 units were manufactured in 18k yellow gold. On the secondary market, these timepieces typically trade in the $100,000 to $160,000 range depending on the presence of original paperwork and dial condition. A notable variant includes the \"Yves Klein\" electric blue smooth dial, which commands a significant premium over the standard champagne or white tapisserie versions at international auctions."}, "score": 32, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars; similar gold case profile.", "listing_stats": {"count": 6, "median": 147500.0, "low": 92000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25654ba", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25654ba"}, {"reference": {"slug": "audemars-piguet-25659", "brand": "Audemars Piguet", "ref": "25659", "model": "Royal Oak Perpetual Calendar Gem-Set", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25659", "description": "The Audemars Piguet Royal Oak Perpetual Calendar reference 25659BA was produced during the late 1980s and early 1990s. This 39mm 18k yellow gold model is distinguished by its factory gem-setting, typically featuring a diamond-set bezel and hour markers. It utilizes the ultra-thin automatic caliber 2120/2800, a movement derived from the Jaeger-LeCoultre 920 base. Collectors value this reference for its \"Jumbo\" proportions and its role in the evolution of the perpetual calendar complication within the Royal Oak line. Production numbers for gem-set variants were significantly lower than the standard 25654 or 25820 references, contributing to its scarcity. On the secondary market, these pieces generally command prices in the mid-to-high six-figure range depending on provenance and condition. A notable example featuring a \"Tuscan\" texture dial and factory diamonds sold at auction for over $400,000, reflecting the premium placed on rare dial configurations."}, "score": 32, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars; similar gold case profile.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25659", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25659"}, {"reference": {"slug": "audemars-piguet-25829or", "brand": "Audemars Piguet", "ref": "25829OR", "model": "Royal Oak Perpetual Calendar Openworked", "case_material": "18k Pink Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25829or", "description": "The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25829OR was produced from the late 1990s through approximately 2012. This reference is valued for its 39mm \"Jumbo\" case proportions and the caliber 2120/2802, an ultra-thin self-winding movement visible through the sapphire dial and exhibition caseback. Unlike modern iterations, the 25829OR features a hand-finished skeletonized architecture and traditional leap year indicators without a week display. The 18k pink gold construction was produced in limited quantities compared to steel or tantalum versions, contributing to its scarcity. On the secondary market, this reference typically trades in the mid-to-high six-figure range, often between $250,000 and $450,000 depending on provenance and condition. A notable auction result occurred in 2022 when a well-preserved example sold for over $600,000, reflecting the high demand for the discontinued 39mm perpetual calendar complications within the Royal Oak lineage."}, "score": 32, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars; similar gold case profile.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25829or", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25829or"}, {"reference": {"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": 32, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars; similar gold case profile.", "listing_stats": {"count": 1, "median": 275000.0, "low": 275000.0, "high": 275000.0, "brands": 1, "merchants": 1}, "top_listing": {"id": "h_7404479185005", "title": "Audemars Piguet 1992 Audemars Piguet Royal Oak Quantième Perpetual Calendar 18K YG (Ref. 25636BA) Openwork \"Small Font\" Dial W/ Box, Winder, AP COA, AP Extract, AP Service Papers, & Accessories", "brand": "Audemars Piguet", "model": "1992 Audemars Piguet Royal Oak Quantième Perpetual Calendar 18K YG (Ref. 25636BA) Openwork \"Small Font\" Dial W/ Box, Winder, AP COA, AP Extract, AP Service Papers, & Accessories", "reference": "25636BA", "price_usd": 275000.0, "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": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img027679copy.jpg?v=1716510327", "detail_url": "https://mostexpensivewatches.net/listing/h_7404479185005", "buy_url": "https://mostexpensivewatches.net/out/h_7404479185005", "available": false}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25636ba", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25636ba"}, {"reference": {"slug": "audemars-piguet-25829ba", "brand": "Audemars Piguet", "ref": "25829BA", "model": "Royal Oak Skeletonized Perpetual Calendar", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25829ba", "description": "The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 25829BA was produced from approximately the mid-1990s until the early 2010s. This reference is constructed in 18k yellow gold with a 39mm case diameter and a thickness of 9.3mm, maintaining the \"Jumbo\" proportions favored by collectors. It features the ultra-thin self-winding caliber 2120/2802, which is visible through the sapphire dial and exhibition caseback. The movement is hand-finished with extensive skeletonization and engraving on the bridges and the 21k gold rotor. Collectors value this reference for its bridge between traditional finishing and the integrated bracelet design. On the secondary market, prices typically range from $250,000 to $350,000 depending on the presence of original accessories. Production was limited, with approximately 424 units estimated to have been produced in yellow gold. A notable 2023 auction result at Phillips reached approximately $241,000 for a 1997 example."}, "score": 32, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars; similar gold case profile.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25829ba", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25829ba"}, {"reference": {"slug": "audemars-piguet-25854ti", "brand": "Audemars Piguet", "ref": "25854TI", "model": "Royal Oak Offshore Perpetual Calendar", "case_material": "Titanium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25854ti", "description": "The Audemars Piguet Royal Oak Offshore Perpetual Calendar reference 25854TI was produced during the late 1990s and early 2000s. Collectors target this reference for its 42mm titanium construction, which offers a lighter alternative to the heavier steel and gold variants of the era. It is powered by the self-winding caliber 2120/2802, a movement based on the ultra-thin JLC 920 ebauche integrated with a perpetual calendar module. The dial typically features the \"Petite Tapisserie\" pattern with four sub-dials indicating day, date, month, leap year, and moon phase. Due to limited production numbers, these pieces appear infrequently on the secondary market, generally commanding prices in the $60,000 to $90,000 range depending on condition and provenance. A notable variant includes the 25854ST in stainless steel, though the titanium 25854TI remains distinct for its specific matte finish and weight profile."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25854ti", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25854ti"}, {"reference": {"slug": "audemars-piguet-26574st-royal-oak-perpetual-calendar", "brand": "Audemars Piguet", "ref": "26574ST.OO.1220ST.02", "model": "Royal Oak Perpetual Calendar", "case_material": "Stainless Steel", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-26574st-royal-oak-perpetual-calendar", "description": "The Audemars Piguet Royal Oak Perpetual Calendar reference 26574ST.OO.1220ST.02 was introduced in 2015 and remains in production as a core component of the manufacturer’s high-complication catalog. This reference is distinguished by its 41mm stainless steel case and a blue \"Grande Tapisserie\" dial featuring four sub-dials and a photorealistic moon phase. It houses the self-winding caliber 5134, an ultra-thin movement based on the historic caliber 2120, which includes a 52-week indicator displayed via a central hand pointing to the outer chapter ring. Collectors prioritize this model for its balance of traditional high-complication watchmaking with the durability of steel. On the secondary market, this reference typically trades in the $85,000 to $115,000 range depending on condition and provenance. A notable production detail is the transition from the \"Audemars Piguet\" logo to the applied \"AP\" monogram on later examples within the same reference series."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 6, "median": 147500.0, "low": 72000.0, "high": 275000.0, "brands": 1, "merchants": 4}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 0, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-26574st-royal-oak-perpetual-calendar", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-26574st-royal-oak-perpetual-calendar"}, {"reference": {"slug": "audemars-piguet-25554st", "brand": "Audemars Piguet", "ref": "25554ST", "model": "Royal Oak Perpetual Calendar", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25554st", "description": "The Audemars Piguet Royal Oak Perpetual Calendar reference 25554ST was produced between approximately 1986 and 1991. Collectors prioritize this reference as the first Royal Oak to feature a perpetual calendar complication, marking a significant technical expansion for the model line. It utilizes the ultra-thin automatic caliber 2120/2800, derived from a Jaeger-LeCoultre base. The 39mm stainless steel case maintains the \"Jumbo\" proportions but lacks a leap year indicator on the dial, a characteristic of early generation perpetual calendars. Production was limited, with records suggesting fewer than 300 units were manufactured in steel. On the secondary market, these watches typically trade in the low-to-mid six-figure range depending on provenance and condition. A notable variant includes the \"Yves Klein\" dial, featuring a vibrant blue aesthetic, which often commands a significant premium at international auctions due to its rarity and visual distinction."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 5, "median": 155000.0, "low": 125000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25554st", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25554st"}, {"reference": {"slug": "audemars-piguet-25654pt", "brand": "Audemars Piguet", "ref": "25654PT", "model": "Royal Oak Perpetual Calendar", "case_material": "Platinum", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25654pt", "description": "Produced between 1982 and 1993, the Audemars Piguet Royal Oak Perpetual Calendar reference 25654PT represents the platinum execution of the brand’s second-generation perpetual calendar. Collectors prioritize this reference for its ultra-thin Calibre 2120/2800 movement and the absence of a leap year indicator, which maintains a symmetrical four-subdial layout. The platinum variant is notably rare, with records indicating only 38 units were manufactured out of the total 800 pieces produced across all metals. These watches feature a 39mm \"Jumbo\" case construction without a sapphire caseback, adhering to traditional proportions. On the secondary market, prices typically occupy the mid-to-high six-figure range, often fluctuating between $250,000 and $500,000 depending on dial configuration. A notable production detail includes the transition from the early \"MK1\" dials with smaller Audemars Piguet typography to later versions, with rare \"Tuscan\" textured dials commanding significant premiums at major international auctions."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 5, "median": 155000.0, "low": 125000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25654pt", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25654pt"}, {"reference": {"slug": "audemars-piguet-25654sa", "brand": "Audemars Piguet", "ref": "25654SA", "model": "Royal Oak Perpetual Calendar", "case_material": "Stainless Steel and 18k Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25654sa", "description": "Produced between 1982 and 1993, the Audemars Piguet Royal Oak Perpetual Calendar reference 25654SA is a two-tone execution featuring a stainless steel case and bracelet with an 18k yellow gold bezel and center links. Collectors value this reference for its ultra-thin Caliber 2120/2800 movement and its transitional status, as it lacks a leap year indicator on the dial, maintaining a symmetrical four-subdial layout. The 39mm \"Jumbo\" case dimensions and the absence of the \"Tapisserie\" pattern on many early smooth or matte dials distinguish it from later iterations. Current secondary market prices typically range from $75,000 to $110,000 depending on provenance and condition. Approximately 425 units were produced in this specific steel and gold configuration, making it rarer than the full yellow gold 25654BA. Notable examples featuring \"Yves Klein\" blue dials or early Mark 1 dial signatures often command premiums at international auctions."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: 18k, audemars.", "listing_stats": {"count": 5, "median": 155000.0, "low": 125000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25654sa", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25654sa"}, {"reference": {"slug": "audemars-piguet-25654st", "brand": "Audemars Piguet", "ref": "25654ST", "model": "Royal Oak Perpetual Calendar", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25654st", "description": "The Audemars Piguet Royal Oak Perpetual Calendar reference 25654ST was produced between 1982 and 1998, with approximately 429 units manufactured in stainless steel. Collectors prioritize this reference for its 39mm \"Jumbo\" case profile and the ultra-thin caliber 2120/2800, which lacks a leap year indicator on the dial. Unlike modern iterations, the 25654ST features a smooth, non-tapisserie dial, often found in silver or blue, and a closed caseback. Its historical significance lies in its role as a transitional model that maintained the original Genta proportions while housing a complex complication. Secondary market prices typically range from $120,000 to $180,000 depending on condition and provenance. A notable variant includes the \"Yves Klein\" blue dial, which commands a significant premium at auction. Production records indicate that while 800 total units were planned across all metals, the steel version remains the most sought-after for its utilitarian aesthetic."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 5, "median": 155000.0, "low": 125000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25654st", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25654st"}, {"reference": {"slug": "audemars-piguet-25820pt", "brand": "Audemars Piguet", "ref": "25820PT", "model": "Royal Oak Perpetual Calendar", "case_material": "Platinum", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-25820pt", "description": "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."}, "score": 29, "why_compare": "Same audemars piguet collector universe; shared search intent: audemars, calendar.", "listing_stats": {"count": 5, "median": 155000.0, "low": 125000.0, "high": 275000.0, "brands": 1, "merchants": 3}, "top_listing": {"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 245000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/Audemars_Piguet_Royal_Oak_Perpetual_Calendar_25810OR.OO.0944.01.jpg?v=1777670209", "detail_url": "https://mostexpensivewatches.net/listing/h_7739650343121", "buy_url": "https://mostexpensivewatches.net/out/h_7739650343121", "available": true}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/audemars-piguet-25820pt", "alternatives_url": "https://mostexpensivewatches.net/alternatives/audemars-piguet-25820pt"}]}