Gravimetric Mass & Chronometric Assay Bulletin
The Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics Reference 26240ST.OO.1320ST.08 is a hallmarked 904L Stainless Steel Custom Architecture haute horlogerie timepiece measuring 41.0 mm x 12.4 mm with a verified Mettler-Toledo mass of 180.6g, powered by Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (+0.7 s/d, 297 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. 26240ST.OO.1320ST.08 | SKU: PV-CUST-26240ST.OO.1320ST.08-W433 |
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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) | 180.6g — 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 • 180.6g 904L Steel Edition • 41.0 mm x 12.4 mm |
| V. Mechanical Manufacture Calibre | Audemars Piguet Cal. 4401 Flyback Chronograph — Swiss Super Clone Mechanical Calibre Regulated to +0.7 s/d, 297 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 Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands • Hand-Brushed & Chamfered Integrated Solid Link Bracelet & Deployant Clasp |
Curated within our hallmarked solid 18K gold Audemars Piguet collection, the Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics Reference 26240ST.OO.1320ST.08 exemplifies haute horlogerie metallurgy in 904L Stainless Steel Custom Architecture. 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 Hand-Brushed & Chamfered Integrated Solid Link Bracelet & Deployant Clasp achieve a verified analytical mass of 180.6g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Audemars Piguet Royal Oak Ref. 26240ST.OO.1320ST.08?
The Audemars Piguet Royal Oak Reference 26240ST.OO.1320ST.08 is a precision-engineered luxury timepiece crafted in 904L Stainless Steel Custom Architecture (41.0 mm x 12.4 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 180.6g, 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 Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics — Official Reference 26240ST.OO.1320ST.08 (SKU: PV-CUST-26240ST.OO.1320ST.08-W433).
- Precious Metal Assay: 904L Stainless Steel Custom Architecture verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 180.6g 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 (+0.7 s/d, 297 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 Double Balance Wheel Openworked 41mm Chronometer Regulated Spec Ref. 15407ST.OO.1220ST.01 (161.8g) and the Audemars Piguet Royal Oak Double Balance Wheel Openworked 41mm 22K Gold Rotor 5-Axis CNC Case Ref. 15407ST.OO.1220ST.01 (162.0g).
- 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. 26240ST.OO.1320ST.08?
At 18K Solid Gold 18K Solid Gold Salon, this Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics Ref. 26240ST.OO.1320ST.08 weighs 180.6g 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 26240ST.OO.1320ST.08 and what is its power reserve?
Reference 26240ST.OO.1320ST.08 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 +0.7 s/d, 297 deg.
What dial and bezel specifications distinguish Audemars Piguet Royal Oak Ref. 26240ST.OO.1320ST.08?
Reference 26240ST.OO.1320ST.08 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 41.0 mm x 12.4 mm 904L Stainless Steel Custom Architecture case weighing 180.6g, verified via Fischer XRF spectroscopy and powered by Audemars Piguet Cal. 4401 Flyback Chronograph.
Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics Reference 26240ST.OO.1320ST.08 — Salon Edition
Bespoke Atelier Salon Edition • 180.6g Verified Mass • Audemars Piguet Cal. 4401 Flyback Chronograph