Audemars Piguet · Family: Royal Oak
The Audemars Piguet Royal Oak Selfwinding 41mm ref. 15510ST.OO.1320ST.06 is the steel, three-hand-and-date version of the Royal Oak — no chronograph — powered by the in-house Calibre 4302 with roughly 70 hours of power reserve. Cazador has no verified price observations yet (as of July 25, 2026), so no market range is published here. Its standout differentiator: that 70-hour reserve more than doubles the 40-45 hours typical of the segment.
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The Royal Oak was born in 1972 with Gérald Genta's design for the historic ref. 5402, the first luxury Swiss watch cased in stainless steel with a screwed octagonal bezel, an integrated bracelet, and a machine-guilloché Grande Tapisserie dial. That visual architecture remains the recognizable DNA of the entire family, including this three-hand Selfwinding variant.
Unlike the Royal Oak Chronograph (ref. 26331ST) or the Jumbo Extra-Thin (ref. 16202ST), the 41mm Selfwinding line drops any added complication: just hours, minutes, center seconds, and date.
The mechanical heart of this reference is Calibre 4302, an in-house automatic movement from Audemars Piguet. Its roughly 70-hour power reserve sits well above the 40-45 hours offered by many conventional Swiss automatics.
With 50 meters of water resistance, reference 15510ST.OO.1320ST.06 reads as a daily sports watch rather than a diving instrument, staying true to the Royal Oak's original mission. [UNVERIFIED: the exact launch year of this reference and of Calibre 4302's introduction into the 41mm Selfwinding line are not part of the catalog specs used as a source for this entry].
Cazador currently has no verified price observations for this reference (n=0). This section activates once our valuation team gathers at least 5 reliable PricePoints.
The 15510ST.OO.1320ST.06 drops the chronograph function: just hours, minutes, center seconds, and date, powered by Calibre 4302. The 26331ST adds a chronograph function via Calibre 2385.
It runs Calibre 4302, an in-house automatic movement from Audemars Piguet, with a power reserve of roughly 70 hours.
Yes, rated to 50 meters of water resistance. That figure suits daily wear, not scuba diving: for that use, Audemars Piguet offers dedicated lines like the Royal Oak Offshore Diver.
'Selfwinding' is Audemars Piguet's designation for its three-hand automatic models without added complications, as opposed to the Chronograph or Perpetual Calendar lines.
This entry cannot confirm that: we have no primary source certifying whether this exact reference remains in current catalog [UNVERIFIED].
It's the machine-cut guilloché pattern of small raised squares that Audemars Piguet introduced with the original Royal Oak in 1972 and has kept as the collection's visual signature.