5-Axis CNC & Horological Architecture
The Custom Audemars Piguet Royal Oak Offshore Diver 42mm Reference 15720ST is a 5-axis Swiss CNC commission machined in 904L Stainless Steel Custom Architecture (42.0 mm x 14.2 mm) weighing 168.4g on our Mettler-Toledo analytical balance, driven by Audemars Piguet Cal. 4308 / Cal. 3120 regulated to +0.4 s/d, 298 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 Offshore Diver 42mm | Ref. 15720ST | SKU: AT-CNC-15720ST-W560 |
|---|---|
| 02 / 5-Axis CNC Metallurgy & Gold Purity | 904L Stainless Steel Custom Architecture — 5-Axis Swiss CNC Precision Architecture • 1:1 Authentic Reference Mass • Bespoke Collector Commission |
| 03 / Analytical Bench Weight (1:1 Reference Mass) | 168.4g — 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 • 168.4g 904L Steel Edition • 42.0 mm x 14.2 mm |
| 05 / Regulated Super Clone Movement Calibre | Audemars Piguet Cal. 4308 / Cal. 3120 — Swiss Super Clone Mechanical Calibre Regulated to +0.4 s/d, 298 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 • 300m / 30 ATM |
| 08 / Bespoke Dial & Integrated Bracelet Spec | 42.0 mm x 14.2 mm • Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands • Hand-Brushed & Chamfered Integrated Solid Link Bracelet & Deployant Clasp |
Engineered inside our Geneva 5-axis CNC Audemars Piguet custom atelier, the Custom Audemars Piguet Royal Oak Offshore Diver 42mm Reference 15720ST is machined from solid 904L Stainless Steel Custom Architecture billets to micron-level tolerances (42.0 mm x 14.2 mm). Every bevel, lug chamfer, and Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands is hand-finished on our watchmaker bench, yielding a certified reference weight of 168.4g verified under our Fischer XRF and Mettler-Toledo QC protocol.
What Are the Horological & Metallurgical Benchmarks of Audemars Piguet Royal Oak Offshore Ref. 15720ST?
The Audemars Piguet Royal Oak Offshore Reference 15720ST is a precision-engineered luxury timepiece crafted in 904L Stainless Steel Custom Architecture (42.0 mm x 14.2 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 168.4g, because the Audemars Piguet Cal. 4308 / Cal. 3120 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 Offshore Diver 42mm — Official Ref. 15720ST (SKU: AT-CNC-15720ST-W560).
- 5-Axis CNC Metallurgy: 904L Stainless Steel Custom Architecture case (42.0 mm x 14.2 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: 168.4g confirmed on a Mettler-Toledo analytical gram scale prior to dispatch.
- Super Clone Calibre: Audemars Piguet Cal. 4308 / Cal. 3120 operating at 28,800 vph (4 Hz) with 72-hour power reserve and +0.4 s/d, 298 deg accuracy.
- Sapphire Optics & Sizing: Double anti-reflective sapphire crystal, 300m / 30 ATM sealing, and 19 wrist sizing options (14.0–22.0 cm).
Within the Audemars Piguet Royal Oak Offshore horological sub-silo, collectors also compare the Audemars Piguet Royal Oak Offshore Diver 42mm Ref. 15720ST.OO.A009CA.01 (168.0g) and the Audemars Piguet Royal Oak Offshore Selfwinding Chronograph 43mm Ref. 26420SO.OO.A600CA.01 (174.6g).
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- Homepage Master Register: Return to 18K CUSTOM Homepage (Complete 774-Watch Solid 18K Gold & Pt950 Register)
- 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 904L Steel Edition case of this Audemars Piguet 15720ST machined?
Our Geneva CNC specialists mill the monobloc middle case, bezel, and bracelet geometry on 5-axis Swiss machining centers in 904L Stainless Steel Custom Architecture to achieve the authentic 168.4g 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. 4308 / Cal. 3120 tested on the atelier workbench?
We record a personalized 4K bench video showing the Audemars Piguet Cal. 4308 / Cal. 3120 (28,800 vph, 72-hour reserve) running at +0.4 s/d, 298 deg on our Witschi Chronoscope alongside Fischer XRF and Mettler-Toledo gram scale verification.
What dial and bezel specifications distinguish Audemars Piguet Royal Oak Offshore Ref. 15720ST?
Reference 15720ST 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 42.0 mm x 14.2 mm 904L Stainless Steel Custom Architecture case weighing 168.4g, verified via Fischer XRF spectroscopy and powered by Audemars Piguet Cal. 4308 / Cal. 3120.
Custom Audemars Piguet Royal Oak Offshore Diver 42mm Ref. 15720ST
5-Axis Swiss CNC 904L Stainless Steel Custom Architecture • 168.4g Verified Mass • Regulated Audemars Piguet Cal. 4308 / Cal. 3120