The history of this Audemars Piguet Royal Oak
Audemars Piguet shook up the watchmaking world in 1972 by unveiling a sporty steel timepiece priced at the same level as a solid gold model. Designer Gérald Genta sketched this unique model in a single night. He drew inspiration from a diver’s helmet, whose visor is securely fastened by eight through-bolts. This architectural choice gave rise to a wholly original octagonal silhouette. The creation of this timepiece marked a major technical and aesthetic evolution, proving that a base metal can rival a precious metal thanks to meticulous finishing. The reference 15500ST.OO.1220ST.02 continues in this vein, offering contemporary proportions and a modernised movement. This evolution meets the expectations of collectors seeking enhanced legibility and cutting-edge mechanics whilst retaining the original design of the Le Brassus manufacture.
Case, calibre and strap of this Royal Oak
The stainless steel case measures 41 mm in diameter and is 10.4 mm thick. Its finishes alternate between a precise linear brushed finish and mirror-polished bevels that catch the light. The sapphire crystal protects a ruthenium-grey dial featuring the Grande Tapisserie pattern, crafted using a traditional chisel. The hour marker at 3 o’clock gives way to the date window, creating a refined symmetry. This timepiece is powered by the Calibre 4302 self-winding mechanical movement. It comprises 257 components and beats at a frequency of 4 Hz. Its power reserve is 70 hours. The open sapphire crystal case back reveals an open-worked rose gold oscillating weight. The watchmakers have applied hand-finished details, including Côtes de Genève on the bridges and a pearl finish on the main plate. The integrated steel bracelet is secured with a double folding clasp. The screw-down hexagonal crown ensures water resistance to 50 metres.
Why this Audemars Piguet watch
The ruthenium dial offers a mineral hue that varies from pearl grey to anthracite depending on the lighting. This particular model is no longer produced by the manufacturer. Its unavailability enhances its appeal on the second-hand market. The balance between its sculptural case and the finesse of its details makes it a versatile watch for everyday wear. The switch to the 4302 calibre provides chronometric stability and an extended power reserve suited to the modern wearer. Lovers of fine mechanical watchmaking will appreciate the large open-worked balance wheel visible on the case back. Acquiring this model represents an opportunity to add a seminal piece of watch design to one’s personal collection.
Contents and condition
This timepiece is supplied with its green lacquered wooden case, outer box and user manual. A full service invoice issued by the manufacturer at the end of 2025 confirms its authenticity and mechanical maintenance. The watch is in excellent visual condition. The factory polishing carried out during its time in the workshop has restored the lustre of the brushed surfaces and the sharpness of the polished chamfers.
Warranty and delivery
The Swiss Collector guarantees the authenticity of this timepiece. This model comes with a 24-month warranty. We accept returns within 10 days in accordance with our terms and conditions. As Switzerland’s leading second-hand retailer, backed by the largest network of boutiques, we offer online booking for a fitting and in-store collection, or fully secure international delivery.
* Very good condition – Watch has been worn and polished. Slight signs of external wear. Case and strap in excellent overall condition.
