Where the standard Royal Oak is an ultra-thin architectural dress-sports icon, the Audemars Piguet Royal Oak Offshore (“The Beast”)—spanning the 42mm Offshore Diver Ref. 15720ST / 15710ST and the 43mm/44mm Offshore Chronograph Ref. 26420 / 26400—is unapologetic heavy-duty horology. With exposed rubber/ceramic gaskets beneath the octagonal bezel, oversized Méga Tapisserie dial squares, and an internal rotating diving ring, APS Factory (APSF) and ZF Factory have engineered 1:1 clones that capture every ounce of the Offshore’s presence.
- True Clone Calibre 4308 (APSF 15720ST): Features instant-jump date, 60-hour power reserve, and the blackened 22k-style AP openworked rotor visible through the sapphire back.
- 10 o’Clock Internal Dive Scale Mechanism: Unscrewing the rubber-clad crown at 10 o’clock rotates the inner unidirectional 60-minute diving ring with crisp mechanical clicks.
- One-Click Interchangeable Strap System: On 15720ST and 26420 models, pressing the twin integrated push-studs beneath the lugs releases the vulcanized rubber strap in two seconds with zero tools.
- Sintered Ceramic Bezel & Push-Piece Guards (44mm Chrono): Scratch-proof brushed black ceramic bezels and chronograph pusher guards that never ding or scuff.
1. The 42mm Offshore Diver (Ref. 15720ST & 15710ST): Inner Bezel Mechanics
Why does the Royal Oak Offshore Diver place its diving scale underneath the sapphire crystal instead of on the outer bezel? Because Gérald Genta’s octagonal bezel secured by 8 hexagonal bolts cannot rotate! By housing the unidirectional 0–15 minute colored zone inside the rehaut and linking it via a dedicated pinion gear at 10 o’clock, Audemars Piguet preserved the iconic eight-sided silhouette while achieving full ISO 6425 diver functionality.
Both APSF and ZF Factory replicate this exact internal gear train alongside the deep, waffle-iron Méga Tapisserie dial texture seen across our AP Royal Oak Offshore Méga Tapisserie Dial and AP Royal Oak Offshore Black Dial Ceramic Bezel.
| Offshore Specification | Offshore Diver 15720ST (42mm) | Offshore Chrono 44mm / 26420 | APSF / ZF Super Clone Standard |
|---|---|---|---|
| Movement Calibre | AP Calibre 4308 (28,800 vph) | AP Calibre 3126 / 4401 Chrono | True Clone 4308 & Working Chrono |
| Bezel & Crown Material | Brushed 904L + Ceramic Crowns | Brushed Black Ceramic Bezel | Real Sintered Brushed Ceramic |
| Internal 10h Dive Ring | 60-Click Unidirectional Ring | Fixed Tachymeter Inner Ring | Smooth 10h Crown Gear Drive |
| Strap Architecture | One-Click Quick-Release FKM | Vulcanized FKM Rubber + Ti Buckle | Zero-Dust High-Density FKM Rubber |
| Cyclops Magnification | Internal Flush Date Loupe | Flush Anti-Reflective Loupe | Blue/Clear AR Coated Loupe |
2. 44mm Offshore Chronographs: Rose Gold, Ceramic & Forged Carbon
For collectors with 7-inch+ wrists who want maximum visual impact, the 44mm Offshore Chronograph pairs architectural broad-shouldered push-piece guards with contrasting sub-dials. Inspect our AP Royal Oak Offshore 44mm Rose Gold & Black Ceramic, the classic AP Royal Oak Offshore Chronograph 44mm, or the compact mid-size AP Royal Oak Offshore 37mm Rose Gold.
- ⌚ AP Royal Oak Offshore Black Dial Ceramic — Brushed Ceramic Bezel & Méga Tapisserie Dial
- ⌚ AP Royal Oak Offshore 44mm 18k Rose Gold PVD — Ceramic Push-Piece Guards & Vulcanized Strap
- ⌚ AP Royal Oak Offshore Chronograph 44mm — Functional 12-6-9 Registers & Tachymeter Scale
- ⌚ AP Royal Oak Offshore Méga Tapisserie Edition — 3D Waffle Dial & Exhibition Caseback
Collector FAQ & Pre-Shipment QC Answers
Can I swim with the APSF or ZF Royal Oak Offshore Diver?
Yes. Both factories fit double rubber O-rings on the screw-locked 3 o’clock and 10 o’clock crowns, plus a thick caseback gasket, and every piece is vacuum-tested prior to dispatch.
How does the quick-release strap system work on the 15720ST?
Press the rectangular button on the underside of each lug and slide the strap out—no spring-bar screwdriver required.
