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The steel Audemars Piguet Royal Oak Selfwinding 15550ST is a 37 mm watch with a 9.1 mm-thick case, 50 m water resistance and the automatic Calibre 5900, which has a stated 60-hour power reserve. This article focuses on the blue-dial reference 15550ST.OO.1356ST.06. AP’s specifications can establish what the watch is; they cannot substitute for hands-on observations of fit, comfort, finishing in changing light or daily operation.
Which 15550ST is this?
The 15550ST is a family of 37 mm, stainless-steel Royal Oak Selfwinding watches. The exact variant covered here is reference 15550ST.OO.1356ST.06, listed on Audemars Piguet’s US site with a “Bleu nuit nuage 50” dial and “Grande Tapisserie” pattern. It has an integrated stainless-steel bracelet. AP’s collection listing includes other 15550ST suffixes, including .07 and .08; those are separate dial variants, so the .06’s price and details should not be assumed to apply to them. See AP’s product page for reference .06 and its broader watch collection.
Case, dial and bracelet specifications
| Feature | 15550ST.OO.1356ST.06 |
|---|---|
| Case | Stainless steel; 37 mm diameter and 9.1 mm thick |
| Crystal and caseback | Glareproofed sapphire crystal and caseback |
| Water resistance | 50 m |
| Dial | Bleu nuit nuage 50 with Grande Tapisserie pattern |
| Markers and hands | Applied white-gold hour markers and Royal Oak hands with luminescent coating |
| Display | Hours, minutes, central seconds and date |
| Bracelet and clasp | Stainless-steel bracelet with AP folding clasp; bracelet length and adjustment range are not stated on the cited AP product page |
These are manufacturer-published specifications for the identified reference, not independent measurements. A 37 mm diameter and 9.1 mm thickness answer the basic sizing question, but do not determine whether the watch will look or feel right on a particular wrist. Wrist shape, bracelet fit and personal preference matter; try it on if possible.
Calibre 5900: frequency and power reserve
The automatic Calibre 5900 is specified at 29 jewels and 188 parts. It measures 26.2 mm in diameter and 3.9 mm thick, runs at 4 Hz (28,800 vibrations per hour), and has a stated power reserve of 60 hours. Those figures describe the movement; they do not establish the accuracy of an individual watch in use.
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- Compatibility: Audemars Piguet Royal Oak
- Material: Stainless Steel Total Length: 160mm Thickness: 3mm
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- Package Included: 1 x Strap
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AP’s design-history account says the 37 mm collection introduced Calibre 5900 and describes it as thinner and higher-frequency than Calibre 3120. In AP’s words, “The new selfwinding hour, minute and second movement, Calibre 5900, debuts in the 37 mm collection, while all chronograph models in 41 mm are now powered by Calibre 4401, the Manufacture’s latest integrated flyback chronograph.” Read the full Royal Oak design-evolution account.
What changed in the 2022 Royal Oak design?
AP describes its 2022 Royal Oak evolution as retaining the collection’s recognizable design while adapting the case, bracelet and dial ergonomics across 34, 37, 38 and 41 mm sizes. The manufacturer points to a more integrated caseback, a more pronounced bracelet taper, thinner links, and more harmonized proportions between markers and hands. These are AP’s design descriptions, not independent evidence that the changes improve comfort for every wearer.
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- Fit For Audemars Piguet Royal Oak 41mm Watch Case
- Fit for Model Number: 15400OR.OO.D002CR.01 , 15400ST.OO.1220ST.03 , 15400ST.OO.1220ST.01 , 26320OR.OO.D002CR.01 , 15400OR.OO.1220OR.01...
- Sise: 10.5mmx1.5mmx1.0mm M:1.4mm
- Package Include: 4 pieces
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How much does the Royal Oak 15550ST cost?
At the time represented by the cited product information, AP’s US page displayed $30,400 for the exact reference 15550ST.OO.1356ST.06. This is a date-sensitive, US-market manufacturer-listed price—not proof of a completed transaction, current authorized-dealer stock, or a secondary-market value. Check the official reference page for current information, and verify the suffix before comparing prices across dial variants.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Warranty and purchase checks
Audemars Piguet says its watches carry a two-year warranty against manufacturing defects, subject to its International Sales Warranty. AP also says five-year coverage applies to watches bought through its authorized network from 1 January 2017, subject to that warranty. For a specific watch, confirm the purchase channel, registration and applicable coverage with AP; do not assume that every pre-owned watch has the same warranty status.
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Best Value
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- Made top 316 L Stainless Steel material, which is environmentally friendly and healthy, with moderate softness and very comfortable to wear.
- Moderate softness, very comfortable to wear, molded, strong and durable, wear-resistant strap/wristband, suitable for original watch.
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- Band Width: 28mm.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
