{"reference": {"slug": "audemars-piguet-26591io", "brand": "Audemars Piguet", "ref": "26591IO", "model": "Royal Oak Concept Supersonnerie", "case_material": "Titanium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-26591io", "description": "The Audemars Piguet Royal Oak Concept Supersonnerie reference 26591IO.OO.A002CA.01 was introduced in 2016 and remains a low-volume production piece within the brand’s high-complication catalog. Collectors prioritize this reference for its caliber 2937 movement, which utilizes a patented soundboard technology and a unique striking mechanism designed to amplify the minute repeater’s chime. The 44mm case is constructed from sandblasted titanium with a black ceramic bezel, screw-locked crown, and pushpieces. Its openworked dial features a black 30-minute counter and yellow accents for legibility. This reference represents the commercial application of the RD#1 prototype, focusing on acoustic performance in a water-resistant case. On the secondary market, this model typically commands prices in the mid-to-high six-figure range, often between $350,000 and $550,000 depending on condition. A notable production detail is the caseback’s \"sonic\" perforations, which allow sound to escape while maintaining 20-meter water resistance."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "ap-royal-oak-concept-supersonnerie", "brand": "Audemars Piguet", "reference": "26591IO", "model": "Royal Oak Concept Supersonnerie", "case_material": "Titanium", "hammer_usd": 1152000, "year_sold": 2024, "venue": "Phillips Geneva", "lot_summary": "Minute repeater + tourbillon + flyback chronograph. The Supersonnerie research project's flagship — produced ~5 per year.", "url": "https://mostexpensivewatches.net/auctions/ap-royal-oak-concept-supersonnerie"}]}