# Audemars Piguet Royal Oak Selfwinding 37 mm – A 2022 Evolution of an Icon The Audemars Piguet Royal Oak Selfwinding 37 mm (reference 15550ST.OO.1356ST.02) arrives as a quietly powerful statement in the brand’s celebrated collection. Launched in 2022 to mark the 50th anniversary of the original Royal Oak, the model pairs the unmistakable octagonal bezel and “Grande Tapisserie” dial with a new, higher‑frequency movement and a slimmer, more ergonomic case. Priced at **US $24,100**, it positions itself as the most versatile Royal Oak in the range – a claim backed by its unisex 37 mm size, refined bracelet and a movement upgrade that delivers smoother seconds without sacrificing the 60‑hour power reserve that long‑time fans expect. Below, we break down why the 37 mm version feels both familiar and freshly relevant, and where it may fall short of the lofty expectations set by its heritage. --- ## Heritage — the model's place in the brand's line and its launch context The Royal Oak debuted in 1972 as the world’s first luxury sports watch in stainless steel, a design that forever altered the industry. Fifty years later, Audemars Piguet chose the **Royal Oak Selfwinding 37 mm** to celebrate that milestone. The model entered the line in **2022**, joining the broader family that already includes the larger **Royal Oak Selfwinding 41 mm** (reference 15500ST, launched 2019 at roughly US $33,000). While the 41 mm version reaffirmed the collection’s “integrated” aesthetic, the 37 mm piece was conceived as a **unisex** offering, deliberately sized to sit comfortably on both smaller wrists and those that prefer a subtler presence. The decision to introduce a new calibre – the **Calibre 5900** – at the same time underscores Audemars Piguet’s intent to blend heritage with technical progress. In the brand’s own language, the 37 mm line “refines its silhouette and enhances its ergonomics for a sleeker and more comfortable experience,” a sentiment echoed across the three source articles. --- ## Design & Case — case dimensions, materials, dial At **37 mm** in diameter, the case is the smallest stainless‑steel Royal Oak currently in production. The **case thickness** is not explicitly listed in the source data, but the movement itself is housed in a **3.9 mm** package, indicating a relatively slim overall profile for a steel sports watch. The case is crafted from **stainless steel** and retains the iconic octagonal bezel with eight visible screws. What sets this iteration apart are the **larger polished chamfers** that replace the more angular edges of earlier models. The source describes these chamfers as creating “a slenderer aesthetic offering stronger plays of light between the satin‑brushed and polished surfaces.” The result is a watch that catches the eye from multiple angles without relying on oversized proportions. The dial continues the Royal Oak tradition of **Grande Tapisserie** – a patterned guilloché that adds depth and texture. Buyers can choose between two colourways: **Bleu Nuit Nuage 50**, a deep midnight‑blue, and a lighter **light‑blue** version. Both maintain the high‑contrast white hour markers and the signature “tapisserie” background, ensuring legibility while reinforcing the watch’s sporty elegance. A refined **trapezoidal link bracelet** completes the package. The links echo the bezel’s geometry, and the bracelet’s integration with the case is seamless, preserving the “integrated” look that defines the Royal Oak line. The source notes that the bracelet, together with the case, “encompass larger polished chamfers for a slenderer aesthetic,” reinforcing the design’s cohesive language. --- ## Movement & Performance — calibre, power reserve, accuracy The heart of the 37 mm model is the **Calibre 5900**, a movement produced for Audemars Piguet by specialist **Vaucher**. It replaces the older **Calibre 3120** and brings three key technical improvements: | Feature | Calibre 5900 | Calibre 3120 (predecessor) | |---------|--------------|----------------------------| | Frequency | **4 Hz** (28,800 vph) | 3 Hz (21,600 vph) | | Thickness | **3.9 mm** | Not specified (thicker) | | Power Reserve | **60 hours** | 60 hours (unchanged) | The higher **4 Hz** frequency translates to smoother sweeping seconds, a subtle but perceptible upgrade that enhances the watch’s kinetic feel. The movement’s **3.9 mm** thickness enables the slimmer case profile while preserving the same **60‑hour power reserve** that owners of the older calibre have come to expect. The source confirms that the Calibre 5900 is “thinner and endowed with a higher frequency compared to Calibre 3120, which it replaces.” Although explicit accuracy figures (e.g., ± 2 seconds/day) are not provided, Audemars Piguet’s in‑house finishing standards typically ensure a performance that meets or exceeds industry norms for a high‑grade automatic. Water resistance is rated at **50 meters**, sufficient for everyday wear and light water exposure (e.g., rain, hand washing) but not intended for swimming or diving. --- ## On the Wrist — wearability, lug‑to‑lug, comfort notes The **37 mm** case size makes the watch genuinely **unisex**, a point highlighted by the source: “With its unisex 37 mm case size, this might well be the most versatile RO model in the collection today.” The slimmer profile, achieved through the Calibre 5900’s reduced thickness, contributes to a comfortable fit even on smaller wrists. While exact **lug‑to‑lug** measurements are not disclosed, the proportionate relationship between the 37 mm diameter and the case’s overall slenderness suggests a balanced spread that sits low on the wrist, reducing the “over‑hang” some wearers experience with larger steel sports watches. The **larger polished chamfers** on both case and bracelet not only enhance visual appeal but also soften the edges that contact the skin, improving comfort during extended wear. The trapezoidal bracelet’s integration with the case eliminates gaps that can cause pinching, and the polished‑to‑brushed transition adds a tactile contrast that many owners find pleasing. Overall, the watch feels **lighter** than a comparable 41 mm Royal Oak, a benefit of the thinner movement and refined case construction. The combination of ergonomic design and the iconic “octagonal” silhouette makes the 37 mm model sit naturally on the wrist, whether paired with a shirt cuff or a casual T‑shirt. --- ## When to Wear — occasion, setting and dress‑code fit Because of its **mid‑size case** and **refined aesthetic**, the Royal Oak Selfwinding 37 mm comfortably bridges the gap between casual sports‑watch territory and more formal settings. The **Grande Tapisserie** dial, especially in the deep **Bleu Nuit Nuage 50**, carries a subtle richness that works well with a tailored suit, while the stainless‑steel bracelet and iconic bezel keep the look grounded enough for a weekend brunch or a day at the office. The watch’s **50‑meter water resistance** and robust steel construction also make it suitable for activities like sailing or light outdoor adventures, provided the wearer avoids submersion. In short, the 37 mm model is a **versatile companion** for: * **Business casual** – paired with a blazer and chinos. * **Smart‑formal** – under a crisp dress shirt for evening events. * **Weekend leisure** – with jeans and a polo, the watch’s sporty heritage shines. * **Travel** – the moderate size and comfortable bracelet reduce fatigue on long flights. The source’s positive review line, “This might well be the most versatile RO model in the collection today,” captures precisely why the 37 mm version feels at home across such varied dress codes. --- ## Value & Verdict — price‑positioning + final take At a **retail price of US $24,100**, the Royal Oak Selfwinding 37 mm sits **significantly lower** than the **US $33,000** price tag of the larger 41 mm counterpart. The source explicitly notes that “Retail held at $24,100, which makes the 15550 more watch for the same money,” positioning the 37 mm as a **value‑driven entry point** into the Royal Oak family. From a specifications standpoint, the 37 mm model offers: * The **new Calibre 5900** with a smoother 4 Hz beat and a thin 3.9 mm profile. * The same **60‑hour power reserve** as the older movement, ensuring reliable daily wear. * A **unisex 37 mm case** that widens its appeal across wrist sizes. * The **iconic Grande Tapisserie** dial in two elegant colourways. The watch’s **design refinements** – larger polished chamfers, a slimmer case, and a more ergonomic bracelet – are tangible upgrades that enhance both aesthetics and comfort without compromising the brand’s DNA. ### Verdict The Audemars Piguet Royal Oak Selfwinding 37 mm succeeds in delivering a **modern reinterpretation** of a classic without sacrificing the core elements that make the Royal Oak instantly recognizable. Its **movement upgrade** provides a smoother visual experience, while the **size and ergonomics** broaden its wearability. Priced at **US $24,100**, it offers a compelling blend of heritage, technical merit and everyday versatility, making it arguably “the clear pick on specs and value” among current Royal Oak offerings. **Flaws?** The watch’s **50‑meter water resistance** may feel limiting for those seeking a true dive‑capable sports watch, and the lack of an explicit **sapphire crystal** specification (not confirmed in the source) could be a point of caution for collectors who prioritize that detail. However, these are minor considerations in the context of a piece that balances **iconic design** with **contemporary performance**. **Bottom line:** For anyone looking to own a piece of Audemars Piguet’s 50‑year legacy without stepping into the higher‑priced tier of the collection, the Royal Oak Selfwinding 37 mm delivers **more watch for the same money**, a smoother movement, and a universally flattering size. It stands as a testament that even after half a century, the Royal Oak can still evolve while staying unmistakably itself.