Audemars Piguet · Royal Oak

Strap for Royal Oak Selfwinding 41 Stainless Steel / Green / 50th Anniversary

Integrated bracelet: measurements, the most common questions, and the way to a made-to-measure strap.

Integrated bracelet

The Audemars Piguet Royal Oak 15510ST.OO.1320ST.04 is designed with a bracelet integrated into the case. For a compatible made-to-measure strap, the Casati Milano atelier builds it on your watch.

Case diameter41 mm
Reference15510ST.OO.1320ST.04
FamilyRoyal Oak
MovementAudemars Piguet caliber AP 4302 hours, minutes, seconds | date
Year2022 - 2022
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

The Royal Oak 15510ST.OO.1320ST.04, seen from the bench

The Royal Oak is one of the flagship models of Audemars Piguet, characterized by the distinctive octagonal case with visible screws. The reference 15510ST.OO.1320ST.04 features the automatic AP 4302 caliber with indication of hours, minutes, seconds, and date. The model presents a stainless steel construction with an integrated bracelet of the same material.

Frequently asked questions

Can a standard strap be fitted to the Royal Oak 15510ST.OO.1320ST.04?

No. The bracelet is integrated directly into the case: there is no standard lug where an aftermarket strap can be attached. This is an architectural choice made from the very beginning. If you want a leather strap on this Royal Oak, I build it to measure, starting from the physical case.

How does the bespoke service work for this Royal Oak?

I work through <a href="/pages/casati-booking">Casati Milano</a>, my appointment-only atelier at Via XX Settembre 15 in Milan. I take measurements directly from your watch — no generic templates. Every attachment is hand-shaped to follow the octagonal geometry of the case, millimetre by millimetre.

Which leather do I recommend for this Royal Oak?

I prefer Mississippi alligator with a wide scale. The Royal Oak has a specific character: sporting at heart, rigorous in form. Alligator holds that tension without tipping into decorative excess. The wide scale works well with the proportions of the octagonal case, without overwhelming them.

How long does a well-made strap last on a watch of this calibre?

A strap built properly, with selected leather and hand-stitched seams, lasts easily five to eight years of regular wear. Quality leather does not deteriorate: it ages, developing a patina that tells the story of time worn. Care is straightforward: keep it away from prolonged water exposure and condition the leather once a year.

Why was the 1972 Royal Oak so disruptive for watchmaking?

Gérald Genta brought stainless steel into a segment where gold reigned supreme. Before the Royal Oak, steel was considered a lesser material. The octagonal case with visible hexagonal screws and the guilloché tapisserie dial were a precise formal provocation. I have seen many watches pass through the bench over the years: that geometric coherence, fifty years on, has lost none of its force.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only