Audemars Piguet · Royal Oak

Strap for Royal Oak Chronograph 38 Stainless Steel / Silver

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

Integrated bracelet

The Audemars Piguet Royal Oak 26315ST.OO.1256ST.01 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 diameter38 mm
Reference26315ST.OO.1256ST.01
FamilyRoyal Oak
MovementOmega caliber 1154 hours, minutes, small seconds | date | Chronograph
Year2019
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 26315ST.OO.1256ST.01, seen from the bench

The Royal Oak Chronograph 38 is a stainless steel model designed with an octagonal case and integrated bracelet. The 38mm case features a refined steel construction paired with a complex manufacturing movement. This model represents the contemporary evolution of the iconic design created by Gérald Genta in 1972, combining industrial architecture with haute horlogerie craftsmanship.

Frequently asked questions

Can a strap be fitted to the Audemars Piguet Royal Oak 26315ST.OO.1256ST.01?

The Royal Oak's bracelet is integrated directly into the case: there is no standard lug to attach an off-the-shelf strap. The attachment is proprietary, designed by Audemars Piguet as an inseparable part of the overall design. In the atelier, I build the strap to measure, working from the actual watch case.

How does the bespoke strap service work for this Royal Oak?

The work is done exclusively by appointment at <a href="/pages/casati-booking">Casati Milano</a>, at Via XX Settembre 15 in Milan. I bring the watch to the bench, take measurements directly from the case, and shape every element by hand. I do not work from photographs or technical sheets: the watch must be present.

Which leather do I recommend for this Royal Oak?

For a watch with this character — steel, sharp geometry, sporting soul — I prefer natural Barenia. It ages with wear, develops a patina that adapts to the wrist over time, and holds its own against the chiselled steel without overpowering it. Mississippi Alligator in mirror-gloss finish is the other strong option: more formal, very precise, for those who wear the Royal Oak in dressed-up settings as well.

How long does a well-made strap last?

A strap built from quality leather and hand-stitched will easily last five, seven, even ten years with proper care. That means keeping it away from standing water, letting it air dry after heavy use, and conditioning the leather two or three times a year. Barenia in particular does not show its age: it carries it like a second skin.

What sets the Royal Oak apart from other sports watches in steel?

In 1972, Gérald Genta brought an octagonal case with exposed screws to a steel sports watch at a time when nobody was doing that. Over the years I have seen many watches come across the bench: very few have such a radical formal coherence between every single element. The manufacture movement inside is not an added detail — it is part of the same constructive logic.

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