Recorded in our Monte-Carlo solid 18K gold Audemars Piguet register, the Audemars Piguet Royal Oak Selfwinding 41mm Reference 15500ST unites authentic Geneva proportions (41.0 mm x 10.5 mm) with a certified 904L Stainless Steel Custom Architecture mass of 166.2g. 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 Selfwinding 41mm — Official Reference 15500ST (SKU: MC-CUST-15500ST-W77).
• Precious Metal Alloy: 904L Stainless Steel Custom Architecture with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 166.2g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Audemars Piguet Cal. 4302 - 70h Power Reserve operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.6 s/d, 301 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 50m / 5 ATM water resistance.

Within the same Audemars Piguet horological silo, collectors also compare the Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Master Watchmaker Spec Ref. 26331ST (180.4g) and the Audemars Piguet Royal Oak Double Balance Wheel Openworked 41mm Ref. 15416CE.OO.1225CE.01 (135.4g).