5-Axis CNC & Horological Architecture
The Custom Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 is a 5-axis Swiss CNC commission machined in 18K White Gold Au750 (41.0 mm x 12.4 mm) weighing 158.7g on our Mettler-Toledo analytical balance, driven by Audemars Piguet Cal. 4401 Flyback Chronograph regulated to +0.8 s/d, 299 deg at 28,800 vph with a 72-hour power reserve beneath a double anti-reflective sapphire crystal.
| 01 / CNC Blueprint Entity & Reference | Audemars Piguet — Royal Oak Selfwinding Chronograph 41mm | Ref. 26240BC.SS.1320BC.01 | SKU: AT-AU750-26240BC.SS.1320BC.01-W129 |
|---|---|
| 02 / 5-Axis CNC Metallurgy & Gold Purity | 18K White Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| 03 / Analytical Bench Weight (1:1 Reference Mass) | 158.7g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| 04 / Custom Bezel, Gem-Setting & Case Geometry | 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 |
| 05 / Regulated Super Clone Movement Calibre | Audemars Piguet Cal. 4401 Flyback Chronograph — Swiss Super Clone Mechanical Calibre Regulated to +0.8 s/d, 299 deg |
| 06 / Barrel Power Reserve & Balance Frequency | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| 07 / Optical Sapphire Crystal (Double AR) & Sealing | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 50m / 5 ATM |
| 08 / Bespoke Dial & Integrated Bracelet Spec | 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 |
Engineered inside our Geneva 5-axis CNC Audemars Piguet custom atelier, the Custom Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Reference 26240BC.SS.1320BC.01 is machined from solid 18K White Gold Au750 billets to micron-level tolerances (41.0 mm x 12.4 mm). Every bevel, lug chamfer, and Diamond-Set Bezel with Solid 18K Gold Applied Hour Markers & Hands is hand-finished on our watchmaker bench, yielding a certified reference weight of 158.7g verified under our Fischer XRF and Mettler-Toledo QC protocol.
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 the Audemars Piguet Cal. 4401 Flyback Chronograph movement is regulated across six positions to chronometric tolerances with a 72-hour power reserve.
5 Core CNC & Chronometric Specifications:
- Blueprint Reference: Custom Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold — Official Ref. 26240BC.SS.1320BC.01 (SKU: AT-AU750-26240BC.SS.1320BC.01-W129).
- 5-Axis CNC Metallurgy: 18K White Gold Au750 case (41.0 mm x 12.4 mm) and Octagonal Brushed & Chamfered Bezel Locked by 8 White Gold Hexagonal Screws with Anti-Reflective Scratch-Resistant Sapphire Crystal with hand-polished chamfers.
- Verified Bench Mass: 158.7g confirmed on a Mettler-Toledo analytical gram scale prior to dispatch.
- Super Clone Calibre: Audemars Piguet Cal. 4401 Flyback Chronograph operating at 28,800 vph (4 Hz) with 72-hour power reserve and +0.8 s/d, 299 deg accuracy.
- Sapphire Optics & Sizing: Double anti-reflective sapphire crystal, 50m / 5 ATM sealing, and 19 wrist sizing options (14.0–22.0 cm).
Within the Audemars Piguet Royal Oak horological sub-silo, collectors also compare the Audemars Piguet Royal Oak Selfwinding 41mm Ref. 15500ST (166.2g) and the Audemars Piguet Royal Oak Jumbo Extra-Thin 39mm Chronometer Regulated Spec Ref. 15202ST (103.1g).
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- All-Brands Catalogue: Explore Complete 12-Maison Horological Catalogue (/shop/)
- Metallurgical & 4K QC Verification: Fischer XRF Au750 Protocol • 3-Year Mechanical Warranty • Insured Armored Delivery
How is the 18K White Gold case of this Audemars Piguet 26240BC.SS.1320BC.01 machined?
Our Geneva CNC specialists mill the monobloc middle case, bezel, and bracelet geometry on 5-axis Swiss machining centers in 18K White Gold Au750 to achieve the authentic 158.7g reference mass.
Can the bracelet or strap be pre-sized to my exact wrist circumference?
Yes. Choose from 19 precision wrist circumference options (14.0 cm to 22.0 cm, or full unsized factory length). All removed solid links are sealed inside your presentation box.
How is the Audemars Piguet Cal. 4401 Flyback Chronograph tested on the atelier workbench?
We record a personalized 4K bench video showing the Audemars Piguet Cal. 4401 Flyback Chronograph (28,800 vph, 72-hour reserve) running at +0.8 s/d, 299 deg on our Witschi Chronoscope alongside Fischer XRF and Mettler-Toledo gram scale verification.
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.
Custom Audemars Piguet Royal Oak Selfwinding Chronograph 41mm Diamond-Set Bezel 18K White Gold Ref. 26240BC.SS.1320BC.01
5-Axis Swiss CNC 18K White Gold Au750 • 158.7g Verified Mass • Regulated Audemars Piguet Cal. 4401 Flyback Chronograph