Strap for Royal Oak 15400 Stainless Steel / Grey

The Royal Oak's attachment is not a standard lug-and-spring-bar seat: it is a structural part of the case design, conceived by Gérald Genta as a continuous transition between case and bracelet. A strap is entirely possible, built to measure directly on the watch by <a href="/pages/casati-booking">Casati Milano</a>. The end-piece is shaped to the actual profile of the attachment in the atelier, ensuring geometric integration and visual coherence with the original design.

The watch is brought to the atelier during the consultation: the master craftsman takes precise measurements of the actual attachment geometry and builds an end-piece shaped to the specific case profile. Leather, colour, stitching and closure — steel deployant or pin buckle — are then selected, and the strap is made piece by piece. Delivery takes place with the strap already fitted to the watch and verified for comfort and fit.

Cordovan pairs well with the case's dual polished-and-satin finish: its tight grain and progressive patina complement the Tapisserie dial. Matt alligator creates a sophisticated contrast against the bezel's mirror surfaces. For those seeking chromatic continuity with the blue dial, a tone-on-tone calf leather with a light grey contrast stitch builds a coherent and personal combination.

A strap built with selected leathers and waxed-thread stitching on a properly dimensioned structure will accompany the watch for many years without structural failure. The patina that develops over time on quality leathers — particularly cordovan and vegetable-tanned calf — is part of the piece's value, not a sign of deterioration. Regular conditioning with neutral cream and rotating between several straps will further extend its useful life.

The reference was produced between 2017 and 2019, in the final phase of the 15400ST cycle before the transition to the 15500ST. Compared to its predecessors, it brings the case to a 41 mm format with reassessed proportions and the AP 3120 calibre, known for its generous power reserve and 22-carat gold peripheral rotor. The version with a blue dial and white gold applied indices is among the most sought-after on the secondary market, precisely for its combination of legibility, colour and finishing quality.