Audemars Piguet · Family: Royal Oak
The Audemars Piguet Royal Oak Chronograph 26331ST.OO.1220ST.02 is the 41mm steel automatic chronograph within the Royal Oak family, powered by the in-house Calibre 2385 and finished with a Grande Tapisserie dial. Cazador has no verified price observations yet (as of July 22, 2026), so no market range is published here. Its standout differentiator is the octagonal bezel held by eight visible hexagonal screws, a direct legacy of Gérald Genta's original 1972 design.
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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 visual language that broke with the horology of its time: a screwed octagonal bezel, an integrated bracelet, and a machine-guilloché Grande Tapisserie dial. That architecture remains the DNA of the entire Royal Oak collection, including the Chronograph line that this reference belongs to.
The bezel's eight screws are not purely decorative: in Genta's original design they served a structural function, fastening the bezel to the case in a sealed system that avoided a hidden traditional case-back gasket. The Grande Tapisserie dial, with its grid of small raised squares cut by precision guilloché machines, is the other visual signature inherited from 1972.
On the mechanical side, this reference is built around Calibre 2385, an automatic chronograph movement made in-house by Audemars Piguet and integrated into the watch's factory architecture rather than bolted on as a third-party module. [UNVERIFIED: the exact year Calibre 2385 was introduced into the 41mm Royal Oak Chronograph line, and the specific launch year of this reference/dial combination, 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 eight hexagonal screws fasten the octagonal bezel to the case, a structural and aesthetic detail from Gérald Genta's original 1972 design that has remained the visual signature of the entire Royal Oak collection.
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.
It runs Calibre 2385, an in-house automatic chronograph movement from Audemars Piguet. This entry does not confirm its exact power reserve or water resistance due to a lack of verified primary source data [UNVERIFIED].
Designer Gérald Genta created the original Royal Oak in 1972 for Audemars Piguet, the first luxury Swiss watch cased in stainless steel with a screwed octagonal bezel and integrated bracelet.
This entry cannot confirm that: we have no primary source certifying whether this exact reference/dial combination remains in current catalog [UNVERIFIED].
This entry does not confirm an exact water-resistance figure for this reference due to a lack of verified primary source data [UNVERIFIED].