Fischer XRF Au750 (75.0%) & Mettler-Toledo Gravimetric Verification
The Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 is a direct Swiss foundry specimen engineered in 18K White Gold Au750 (41.0 mm x 12.4 mm) with a certified Mettler-Toledo mass of 158.7g, Fischer XRF Au750 metallurgical verification, and Audemars Piguet Cal. 4401 Flyback Chronograph running at 28,800 vph (+0.8 s/d, 299 deg) with a 72-hour power reserve and 50m / 5 ATM rating.
Catalogued in our direct Swiss foundry Audemars Piguet assay archive under Specimen Code LAB-XRF-26240BC.SS.1320BC.01-W129, this Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 is smelted and CNC-machined in 18K White Gold Au750 (41.0 mm x 12.4 mm). Prior to archival release, the completed assembly is weighed on a calibrated Mettler-Toledo balance at 158.7g and scanned via non-destructive Fischer XRF spectroscopy.
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 Diamond-Set Bezel 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 158.7g, 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 Foundry & Laboratory Assay Specifications:
- Foundry Specimen Entity: Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold — Official Ref. 26240BC.SS.1320BC.01 (Specimen LAB-XRF-26240BC.SS.1320BC.01-W129).
- XRF Metallurgical Assay: 18K White Gold Au750 certified for elemental composition and hallmark integrity.
- Mettler-Toledo Mass: 158.7g verified gravimetric parity matching the authentic manufacture reference.
- Chronometric Calibre: Audemars Piguet Cal. 4401 Flyback Chronograph beating at 28,800 vph (4 Hz) with 72-hour reserve and +0.8 s/d, 299 deg Witschi trace.
- Optical & Pressure Testing: Double anti-reflective sapphire crystal, Diamond-Set Bezel with Solid 18K Gold Applied Hour Markers & Hands, and 50m / 5 ATM barometric sealing.
Within the Audemars Piguet Royal Oak horological sub-silo, collectors also compare the Audemars Piguet Royal Oak Jumbo Extra-Thin 39mm Ref. 15202ST.OO.1240ST.01 (103.2g) and the Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Custom Tapestry Dial Deep Crystal Optics Ref. 26240ST.OO.1320ST.08 (180.6g).
- Parent Brand & Royal Oak Silo Hub: Browse All 147 Certified Audemars Piguet Solid 18K Gold & Pt950 Watches
- Technical Research Monograph: Vacuum-Induction Au750 Gold Smelting & Zero-Porosity Casting (All 5 Journal Monographs)
- Homepage Master Register: Return to 18K FACTORY 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 laboratory instruments certify Reference 26240BC.SS.1320BC.01 (Audemars Piguet)?
Every 18K Factory specimen is verified on three calibrated instruments on 4K video: a Mettler-Toledo analytical balance (158.7g), a Fischer XRF spectrometer (18K White Gold Au750), and a Witschi Chronoscope (+0.8 s/d, 299 deg).
Does the 158.7g reading match the authentic original Audemars Piguet 26240BC.SS.1320BC.01 weight?
Yes. Our CNC foundry machines the 18K White Gold case and bracelet to replicate the exact 158.7g reference mass of the authentic manufacture timepiece.
What are the movement specifications for Reference 26240BC.SS.1320BC.01?
Reference 26240BC.SS.1320BC.01 is powered by the Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (4 Hz) with a 72-hour power reserve, regulated across six positions to +0.8 s/d, 299 deg.
What dial and bezel specifications distinguish Audemars Piguet Royal Oak Ref. 26240BC.SS.1320BC.01?
Reference 26240BC.SS.1320BC.01 combines Diamond-Set Bezel 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 158.7g, verified via Fischer XRF spectroscopy and powered by Audemars Piguet Cal. 4401 Flyback Chronograph.
Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Ref. 26240BC.SS.1320BC.01 — XRF Certified Edition
Fischer XRF Verified 18K White Gold Au750 • Mettler-Toledo 158.7g • Audemars Piguet Cal. 4401 Flyback Chronograph
| Assay Specimen ID & Official Reference | Audemars Piguet — Royal Oak Selfwinding Chronograph 41mm | Ref. 26240BC.SS.1320BC.01 | SKU: LAB-XRF-26240BC.SS.1320BC.01-W129 |
|---|---|
| Fischer XRF Elemental Purity & Alloy | 18K White Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| Mettler-Toledo Gravimetric Mass (g) | 158.7g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| Bezel Tolerance, Gem-Setting & Case Dimension | Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal • 158.7g 18K White Gold • 41.0 mm x 12.4 mm |
| Calibre Reference & Witschi Chronometry | Audemars Piguet Cal. 4401 Flyback Chronograph — Swiss Super Clone Mechanical Calibre Regulated to +0.8 s/d, 299 deg |
| Isochronism Frequency & Autonomous Power Reserve | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| Double AR Sapphire Crystal & Barometric Rating | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 50m / 5 ATM |
| Dial Metallurgy & Clasp Hallmark Verification | 41.0 mm x 12.4 mm • Diamond-Set Bezel with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K White Gold Hand-Stitched Alligator / Elastomer Strap & Solid Gold Folding Clasp with Deep Laser Hallmarks |