Audemars Piguet
Royal Oak Selfwinding 37 (50th Anniversary)
Ref. 15550ST.OO.1356ST.02
2022–present · 37mm · caliber AP Cal. 5900: Vaucher-based automatic, central rotor, 28,800bph (4Hz), 60h PR, 29j, 186 components; used in the 37mm Royal Oak Selfwinding introduced for the 2022 50th anniversary, with a commemorative "50 years" oscillating weight on first-year production
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Movement tier: unclassified
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
37 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.
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Authentication
First-year (2022) production carries a commemorative "50 years" oscillating weight; later production reverts to the standard Cal. 5900 rotor, which is a dating signal, not a defect.
Known issues in the market
- Confirm which oscillating weight is present against the claimed production year before assuming a mismatch is a parts swap.
- The 37mm case sits between the 36mm vintage-spec Selfwinding and the 41mm modern date models; confirm the case measures 37mm rather than being sold under a size assumption.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Oscillating weight generation | A commemorative "50 years" engraved rotor on 2022 first-year production, or a standard Cal. 5900 rotor on later production; either is correct for its year | A rotor style inconsistent with the claimed production year, or a non-AP rotor visible through the caseback |
| dial | Bleu Nuit Nuage 50 Grande Tapisserie | Deep midnight-blue Grande Tapisserie dial with white gold applied hour markers and Royal Oak hands | Dial color or Tapisserie grid inconsistent with the Bleu Nuit Nuage 50 specification |
| case | 37mm case proportions | Case measures 37mm diameter at 9mm height; octagonal bezel integrated with the bracelet's first trapezoidal links | Case dimensions inconsistent with 37mm/9mm; bracelet links not integrating cleanly with the case |
Common legitimate replacements
- Cal. 5900 is a Vaucher-based movement used only inside AP cases; no third-party equivalent is sold separately.
Expert resources: AP Royal Oak documentation at audemarspiguet.com. Monochrome Watches hands-on review of the 15550ST for dial and case specification reference.
