Gravimetric Mass & Chronometric Assay Bulletin
The Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Baguette Blue Sapphire Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 is a hallmarked 18K White Gold Au750 haute horlogerie timepiece measuring 41.0 mm x 12.4 mm with a verified Mettler-Toledo mass of 245.8g, powered by Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (+0.8 s/d, 304 deg) with a 72-hour power reserve, double anti-reflective sapphire crystal, and 50m / 5 ATM water resistance.
| I. Official Maison Entity & Reference | Audemars Piguet — Royal Oak Selfwinding Chronograph 41mm | Ref. 26240BC.SS.1320BC.01 | SKU: PV-AU750-26240BC.SS.1320BC.01-W629 |
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| II. Precious Metal Alloy & Hallmark Assay | 18K White Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 245.8g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal • 245.8g 18K White Gold • 41.0 mm x 12.4 mm |
| V. Mechanical Manufacture Calibre | Audemars Piguet Cal. 4401 Flyback Chronograph — Swiss Super Clone Mechanical Calibre Regulated to +0.8 s/d, 304 deg |
| VI. Power Reserve & Oscillation Frequency | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| VII. Double AR Sapphire Crystal & Hermeticity | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 50m / 5 ATM |
| VIII. Dial Finishing, Bracelet & Hallmarked Clasp | 41.0 mm x 12.4 mm • Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K White Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks |
Curated within our hallmarked solid 18K gold Audemars Piguet collection, the Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Baguette Blue Sapphire Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 exemplifies haute horlogerie metallurgy in 18K White Gold Au750. Milled to exact manufacture geometry (41.0 mm x 12.4 mm), the monobloc middle case, Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal, and Integrated 18K White Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks achieve a verified analytical mass of 245.8g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Audemars Piguet Royal Oak Ref. 26240BC.SS.1320BC.01?
The Audemars Piguet Royal Oak Reference 26240BC.SS.1320BC.01 is a precision-engineered luxury timepiece crafted in 18K White Gold Au750 (41.0 mm x 12.4 mm) with Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands, Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal, and a verified Mettler-Toledo mass of 245.8g, because its Audemars Piguet Cal. 4401 Flyback Chronograph movement is regulated across six positions to chronometric tolerances with a 72-hour power reserve.
5 Core Horological & Metallurgical Specifications:
- Entity & Reference: Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Baguette Blue Sapphire Bezel 18K White Gold — Official Reference 26240BC.SS.1320BC.01 (SKU: PV-AU750-26240BC.SS.1320BC.01-W629).
- Precious Metal Assay: 18K White Gold Au750 verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 245.8g total mass weighed on a calibrated Mettler-Toledo laboratory scale.
- Calibre & Oscillating System: Audemars Piguet Cal. 4401 Flyback Chronograph beating at 28,800 vph (4 Hz) with a 72-hour power reserve (+0.8 s/d, 304 deg).
- Crystal & Hermeticity: Scratch-resistant sapphire crystal with double anti-reflective coating and 50m / 5 ATM rating.
Within the Audemars Piguet Royal Oak horological sub-silo, collectors also compare the Audemars Piguet Royal Oak Mini Frosted Gold 23mm 18K Yellow Gold Ref. 67630BA.GG.1312BA.01 (73.1g) and the Audemars Piguet Royal Oak Mini Frosted Gold 23mm 18K Rose Gold Ref. 67630OR.GG.1312OR.01 (73.7g).
- Parent Brand & Royal Oak Silo Hub: Browse All 147 Certified Audemars Piguet Solid 18K Gold & Pt950 Watches
- Technical Research Monograph: Swiss St. Bernard Poincon & Au750 Gold Hallmarks Guide (All 5 Journal Monographs)
- Homepage Master Register: Return to 18K SOLID GOLD Homepage (Complete 774-Watch Solid 18K Gold & Pt950 Register)
- All-Brands Catalogue: Explore Complete 12-Maison Horological Catalogue (/shop/)
- Metallurgical & Escrow Verification: Fischer XRF Au750 Protocol • 3-Year Mechanical Warranty • Insured Armored Delivery
What is the verified authentic gram weight of this Audemars Piguet Ref. 26240BC.SS.1320BC.01?
At 18K Solid Gold 18K Solid Gold Salon, this Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Baguette Blue Sapphire Bezel 18K White Gold Ref. 26240BC.SS.1320BC.01 weighs 245.8g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 18K White Gold reference.
How is the 18K White Gold Au750 purity verified prior to dispatch?
Every timepiece undergoes non-destructive Fischer X-Ray Fluorescence (XRF) spectroscopy confirming elemental bullion composition alongside a personalized 4K scale and hallmark inspection video.
Which movement powers Reference 26240BC.SS.1320BC.01 and what is its power reserve?
Reference 26240BC.SS.1320BC.01 is equipped with the Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (4 Hz) with a 72-hour power reserve, regulated in our Paris and Geneva workshop to +0.8 s/d, 304 deg.
What dial and bezel specifications distinguish Audemars Piguet Royal Oak Ref. 26240BC.SS.1320BC.01?
Reference 26240BC.SS.1320BC.01 combines Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands and Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal within a 41.0 mm x 12.4 mm 18K White Gold Au750 case weighing 245.8g, verified via Fischer XRF spectroscopy and powered by Audemars Piguet Cal. 4401 Flyback Chronograph.
Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Baguette Blue Sapphire Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 — Hallmarked Edition
Hallmarked Au750 & Pt950 Salon Edition • 245.8g Verified Mass • Audemars Piguet Cal. 4401 Flyback Chronograph