Gravimetric Mass & Chronometric Assay Bulletin
The Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Reference 26420IO.OO.A009CA.01 is a hallmarked 904L Stainless Steel Custom Architecture haute horlogerie timepiece measuring 43.0 mm x 14.4 mm with a verified Mettler-Toledo mass of 131.6g, powered by Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (+0.4 s/d, 304 deg) with a 72-hour power reserve, double anti-reflective sapphire crystal, and 100m / 10 ATM water resistance.
| I. Official Maison Entity & Reference | Audemars Piguet — Royal Oak Offshore Selfwinding Chronograph 43mm | Ref. 26420IO.OO.A009CA.01 | SKU: PV-CUST-26420IO.OO.A009CA.01-W530 |
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| II. Precious Metal Alloy & Hallmark Assay | 904L Stainless Steel Custom Architecture — 5-Axis Swiss CNC Precision Architecture • 1:1 Authentic Reference Mass • Bespoke Collector Commission |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 131.6g — 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 • 131.6g 904L Steel Edition • 43.0 mm x 14.4 mm |
| V. Mechanical Manufacture Calibre | Audemars Piguet Cal. 4401 Flyback Chronograph — Swiss Super Clone Mechanical Calibre Regulated to +0.4 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 • 100m / 10 ATM |
| VIII. Dial Finishing, Bracelet & Hallmarked Clasp | 43.0 mm x 14.4 mm • Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands • Integrated Vulcanized Rubber Strap with Precision Audemars Piguet Folding Clasp |
Curated within our hallmarked solid 18K gold Audemars Piguet collection, the Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Reference 26420IO.OO.A009CA.01 exemplifies haute horlogerie metallurgy in 904L Stainless Steel Custom Architecture. Milled to exact manufacture geometry (43.0 mm x 14.4 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 Vulcanized Rubber Strap with Precision Audemars Piguet Folding Clasp achieve a verified analytical mass of 131.6g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Audemars Piguet Royal Oak Offshore Ref. 26420IO.OO.A009CA.01?
The Audemars Piguet Royal Oak Offshore Reference 26420IO.OO.A009CA.01 is a precision-engineered luxury timepiece crafted in 904L Stainless Steel Custom Architecture (43.0 mm x 14.4 mm) with 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 a verified Mettler-Toledo mass of 131.6g, 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 Offshore Selfwinding Chronograph 43mm — Official Reference 26420IO.OO.A009CA.01 (SKU: PV-CUST-26420IO.OO.A009CA.01-W530).
- Precious Metal Assay: 904L Stainless Steel Custom Architecture verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 131.6g 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 (+0.4 s/d, 304 deg).
- Crystal & Hermeticity: Scratch-resistant sapphire crystal with double anti-reflective coating and 100m / 10 ATM rating.
Within the Audemars Piguet Royal Oak Offshore horological sub-silo, collectors also compare the Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Ref. 26420SO.OO.A029VE.01 (174.4g) and the Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm 18K Rose Gold Ref. 26420RO.OO.A002CA.01 (184.3g).
- Parent Brand & Royal Oak Offshore 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. 26420IO.OO.A009CA.01?
At 18K Solid Gold 18K Solid Gold Salon, this Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Ref. 26420IO.OO.A009CA.01 weighs 131.6g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 904L Steel Edition reference.
How is the 904L Stainless Steel Custom Architecture 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 26420IO.OO.A009CA.01 and what is its power reserve?
Reference 26420IO.OO.A009CA.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 +0.4 s/d, 304 deg.
What dial and bezel specifications distinguish Audemars Piguet Royal Oak Offshore Ref. 26420IO.OO.A009CA.01?
Reference 26420IO.OO.A009CA.01 combines Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands and Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal within a 43.0 mm x 14.4 mm 904L Stainless Steel Custom Architecture case weighing 131.6g, verified via Fischer XRF spectroscopy and powered by Audemars Piguet Cal. 4401 Flyback Chronograph.
Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Reference 26420IO.OO.A009CA.01 — Salon Edition
Bespoke Atelier Salon Edition • 131.6g Verified Mass • Audemars Piguet Cal. 4401 Flyback Chronograph