Recorded in our Monte-Carlo solid 18K gold Patek Philippe register, the Patek Philippe Aquanaut Luce Annual Calendar 18K Rose Gold Hand-Chamfered Bevel Spec Reference 5261R unites authentic Geneva proportions (39.9 mm x 10.9 mm) with a certified 18K Rose Gold Au750 mass of 104.6g. Every detail of the Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands, Satin-Brushed Rounded Octagonal Bezel with Mirror-Polished Chamfered Bevels 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: Patek Philippe Aquanaut Luce Annual Calendar 18K Rose Gold Hand-Chamfered Bevel Spec — Official Reference 5261R (SKU: MC-AU750-5261R-W690).
• Precious Metal Alloy: 18K Rose Gold Au750 with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 104.6g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Patek Philippe Cal. 26-330 S QA LU operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.4 s/d, 302 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 30m / 3 ATM water resistance.

Within the same Patek Philippe horological silo, collectors also compare the Patek Philippe Cubitus Self-Winding 18K Rose Gold Ref. 7128/1R-001 (188.0g) and the Patek Philippe Aquanaut Extra-Large Self-Winding Diamond-Set Bezel 18K Rose Gold Ref. 5167/300R-010 (108.4g).