AP Royal Oak Offshore Diver 15720 Rubber Strap Guide: Fit, Colours & FKM Rubber
Strap Guide · Audemars Piguet
The Royal Oak Offshore Diver 15720 introduced something its predecessor never had: a true interchangeable strap system. Here is how to use it to transform the most capable Offshore ever made.
The Offshore Diver 15720 on a Watchstrapco vulcanised rubber strap
Why the 15720 Deserves a Better Rubber Strap
When Audemars Piguet retired the long-running 15710 and unveiled the Royal Oak Offshore Diver 15720, the headline upgrades were obvious: a new in-house Calibre 4308 self-winding movement, a refreshed Méga Tapisserie dial, and ceramic screw-locked crowns. But for strap enthusiasts, the most consequential change was quieter — the 15720 became the first Offshore Diver with AP's tool-free interchangeable strap system.
That single engineering decision changed everything. Where 15710 owners needed a spring bar tool, steady hands, and a degree of courage to swap straps, the 15720 releases its strap with the press of two hidden tabs. A strap change now takes fifteen seconds. Which raises the obvious question: if your watch was designed to change outfits, why leave it in the same one every day?
The factory rubber strap is excellent — this is AP, after all. But it comes in a narrow range of colours, and replacements from the manufacture are famously expensive and slow to source. A precision-moulded aftermarket strap designed specifically for the 15720's integrated case gives you the same seamless fit, in colourways AP will never offer, at a fraction of the boutique price.
One case, endless character — the colourways AP will never offer
What Makes the 15720 Strap Fitment Unique
The Royal Oak Offshore Diver does not use a conventional lug system. The strap flows directly out of the 42mm case between the guards, following the octagonal bezel's geometry. This means generic 26mm or 28mm rubber straps simply do not work — the strap must be moulded to match the exact curvature and locking profile of the 15720 case.
Every Watchstrapco strap for the 15720 is engineered from the case outward: the connection end is profiled to sit flush against the steel with zero gap, the quick-release mechanism engages AP's interchangeable system directly, and the taper is calculated to balance the visual mass of the Méga Tapisserie dial. On the wrist, it reads as original equipment.
Integrated quick-release ends, moulded to the 15720 case profile
Royal Oak Offshore Diver 15720 — Key Specifications
| Case diameter | 42mm, stainless steel |
| Water resistance | 300 metres |
| Movement | Calibre 4308, self-winding, 60-hour power reserve |
| Dial | Méga Tapisserie with rotating inner dive bezel |
| Strap system | AP interchangeable quick-release, integrated fit |
| Watchstrapco compatibility | All 15720 references |
Choosing Your 15720 Rubber Strap: Colour and Character
The 15720 collection — vulcanised FKM rubber, tonal to bold
Tonal — the collector's choice
Matching your strap to the dial is the most refined play. A navy strap on the blue-dial 15720 deepens the Méga Tapisserie pattern; a slate grey strap on the grey dial creates a monochrome tool-watch look that photographs beautifully. Tonal pairings keep attention on the case architecture — which is, ultimately, why you bought a Royal Oak.
Contrast — the modern Offshore spirit
The Offshore line has always been AP's playground, and the 15720's recent colourways — turquoise accents, vibrant dial zones — invite bolder pairings. An orange, white, or khaki green strap against a dark dial turns the Diver into a genuine summer sports watch. Because a swap takes seconds, contrast straps are a zero-commitment experiment.
Stealth — the daily wearer
A matte black strap on any 15720 is the closest thing to a universal answer. It sharpens the steel, disappears under a cuff, and shrugs off saltwater, sunscreen, and daily wear without showing it.
Rubber Compound Matters More Than You Think
Not all rubber straps are rubber. Much of what is sold online is PVC or cheap silicone — materials that attract lint, degrade under UV, and develop a sticky surface within a year. A strap worthy of a five-figure dive watch should be vulcanised FKM rubber: the same compound family used by the Swiss manufactures themselves.
FKM rubber is hypoallergenic, resistant to UV, chlorine and saltwater, and holds a supple matte finish for years. It also takes texture beautifully — which is why our 15720 straps carry a fine woven surface grain that matches the utilitarian character of the Offshore case rather than fighting it. Paired with 300 metres of water resistance and a screw-locked crown, the result is a configuration you genuinely never need to baby.
The signature woven grain, moulded into vulcanised FKM rubber
Fitting a Strap to Your 15720 in Under a Minute
The beauty of the 15720's interchangeable system is that no tools touch your watch. Turn the watch over, press the two release tabs on the underside of the strap where it meets the case, and the strap slides free. Align the new strap's connection end with the case slot, press until you hear the click, and give it a gentle tug to confirm engagement. That's the entire procedure — no spring bars, no scratched lugs, no watchmaker visit.
The integrated quick-release pins — the reason swaps take seconds
We recommend swapping over a soft surface the first few times, and wiping the case connection points with a microfibre cloth before fitting to keep the tolerances clean.
Frequently Asked Questions
Will an aftermarket rubber strap fit my Royal Oak Offshore Diver 15720?
Yes — provided it is moulded specifically for the 15720. The Offshore Diver uses an integrated case connection, so generic straps will not fit. Watchstrapco straps are engineered for the 15720's exact case geometry and quick-release system, and fit all current references.
Do Watchstrapco straps fit the older 15710 as well?
No — the 15710 uses a different, spring-bar-based attachment. The 15720's interchangeable system is unique to the current generation, so the straps are not cross-compatible. We produce dedicated fits for each reference.
Is FKM rubber safe for diving and swimming?
Completely. Vulcanised FKM rubber is highly resistant to saltwater, chlorine and UV exposure, and pairs naturally with the 15720's 300-metre water resistance. Rinse the strap in fresh water after ocean use, exactly as you would the watch head.
Will changing the strap affect my AP warranty?
Fitting a strap via the interchangeable system involves no tools and no modification to the watch — the system exists precisely so owners can change straps freely. Your original AP strap simply goes back in the box for safekeeping and resale value.
How long does delivery take?
We ship worldwide from Singapore, with free international shipping above our free-shipping threshold. Most orders arrive within 5–10 business days.
The 15720 Collection
Precision-moulded FKM rubber straps for the Royal Oak Offshore Diver.
Engineered in every colourway AP won't make.