Recorded in our Monte-Carlo solid 18K gold Audemars Piguet register, the Audemars Piguet Royal Oak Offshore Diver 42mm Reference 15720ST.OO.A052CA.01 unites authentic Geneva proportions (42.0 mm x 14.2 mm) with a certified 904L Stainless Steel Custom Architecture mass of 167.7g. Every detail of the Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands, Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal, and hallmarked clasp is verified under our Fischer XRF Au750 and Mettler-Toledo laboratory protocol.

5 Core Horological & Metallurgical Specifications:

• Registered Entity & Ref: Audemars Piguet Royal Oak Offshore Diver 42mm — Official Reference 15720ST.OO.A052CA.01 (SKU: MC-CUST-15720ST.OO.A052CA.01-W666).
• Precious Metal Alloy: 904L Stainless Steel Custom Architecture with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 167.7g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Audemars Piguet Cal. 4308 / Cal. 3120 operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.5 s/d, 296 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 300m / 30 ATM water resistance.

Within the same Audemars Piguet horological silo, collectors also compare the Audemars Piguet Royal Oak Jumbo Extra-Thin 39mm Geneva Atelier Spec Ref. 15202ST (103.6g) and the Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Ref. 26420TI.OO.A027CA.01 (131.8g).