Recorded in our Monte-Carlo solid 18K gold Patek Philippe register, the Patek Philippe Nautilus Annual Calendar Moonphase Blue Graduated Dial Reference 5726/1A-014 unites authentic Geneva proportions (40.5 mm x 11.3 mm) with a certified 904L Stainless Steel Custom Architecture mass of 147.6g. Every detail of the Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & 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 Nautilus Annual Calendar Moonphase Blue Graduated Dial — Official Reference 5726/1A-014 (SKU: MC-CUST-5726/1A-014-W18).
• Precious Metal Alloy: 904L Stainless Steel Custom Architecture with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 147.6g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Patek Philippe Cal. 324 S QA LU 24H - 21K Gold Rotor operating at 28,800 vph (4 Hz) with 72-hour power reserve (±0.9 s/d, 294 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 120m / 12 ATM water resistance.

Within the same Patek Philippe horological silo, collectors also compare the Patek Philippe Nautilus Self-Winding Ref. 5711/1500A (115.2g) and the Patek Philippe Nautilus Self-Winding Custom SW Dial Free-Sprung Calibre Ref. 5711A (114.9g).