Audemars Piguet Royal Oak 41 mm 26320ST.OO.1220ST.01 Steel Black Audemars Piguet Royal Oak 41 mm 26320ST.OO.1220ST.01…

The Audemars Piguet 26320ST.OO.1220ST.01 is the steel Royal Oak Chronograph in 41 mm with a black Grande Tapisserie dial: three black counters ringed in silver, white gold applied hour markers and hands with luminescent coating, and the date between 4 and 5 o’clock. Inside is the self-winding calibre 2385, and the steel bracelet is integrated into the octagonal case. Audemars Piguet made the 26320ST from 2012, when the Royal Oak Chronograph grew from 39 to 41 mm, until its 2017 update as the 26331ST. Bizak & Co. lists it from $41,662.

What sets the 26320ST.OO.1220ST.01 apart

• The 2012 case. At SIHH 2012 Audemars Piguet enlarged the Royal Oak Chronograph from 39 to 41 mm, the same diameter as the three-hand Royal Oak 15400. The steel case is 10.8 mm thick, with a glareproofed sapphire crystal, a solid case back, a screw-locked crown and water resistance to 50 m, and the octagonal bezel is held by eight hexagonal screws. The integrated steel bracelet, reference 1220ST, closes on an AP folding clasp.
• A black-on-black dial. The dial carries Audemars Piguet’s Grande Tapisserie pattern, larger than the Petite Tapisserie of the 1972 Royal Oak. Its three black counters, ringed in silver and of equal size, are a 12-hour totaliser at 9 o’clock, a 30-minute totaliser at 3 and the small seconds at 6. The hour markers and hands are white gold with luminescent coating.
• Calibre 2385. Audemars Piguet’s version of the Frédéric Piguet 1185, a compact integrated chronograph first made in 1988, with a column wheel and a vertical clutch. Audemars Piguet specifies it at 26.2 mm across and 5.5 mm thick, with 37 jewels, 304 parts, a frequency of 3 Hz (21,600 vph) and a 40-hour power reserve. It shows hours, minutes, small seconds and the date, and sits behind the solid case back.
• Followed by the 26331ST and the 26240ST. For the 20th anniversary of its Royal Oak chronographs in 2017, Audemars Piguet gave the 41 mm model two-tone dials with bigger 30-minute and 12-hour counters, a smaller seconds counter, shorter and wider hour markers and brighter luminescent coating, keeping the case, bracelet and calibre: the 26331ST, whose black steel version, the .02, has silver-toned counters. In 2022 the 26240ST became the first steel Royal Oak Chronograph with an in-house movement, the flyback calibre 4401. Audemars Piguet no longer lists the 26320ST on its website.

How to read 26320ST.OO.1220ST.01

The 26320ST against its siblings and successors

Prices are Bizak & Co. listings read on October 19, 2026. All three 26320ST dials share the case, the 1220ST bracelet and calibre 2385. The black 26320ST costs less than the black 26331ST, which keeps the same case and calibre with larger, contrasting counters, and much less than the 26240ST with its in-house flyback calibre 4401, 70-hour power reserve and sapphire case back. For a smaller case, the 39 mm 26300ST that preceded it uses the same calibre (Bizak & Co. from $27,899).

Checks before you pay the balance

• Reference and dial. The .01, .02 and .03 share one case and bracelet, and the 26331ST.OO.1220ST.02 also has a black dial, with silver-toned counters. Check that the quote and any papers read 26320ST.OO.1220ST.01 and that the counters are black.
• Case and movement numbers. Every Audemars Piguet watch carries an engraved case number and movement number, which Audemars Piguet compares with its archives to date a watch and confirm its authenticity. Ask for a photo of the case back and for the box, papers and service records that come with the watch offered.
• The chronograph. Calibre 2385 sits behind a solid case back, so ask for a short video of the chronograph starting, stopping and resetting, a recent timing reading and the date of its last service.
• Case edges. The Royal Oak case pairs brushed surfaces with polished bevels; ask for daylight photos of the bezel and the case flanks to judge any polishing.
• Bracelet length. Ask how many links come with the 1220ST bracelet, so it can be sized to your wrist, and for photos of the clasp.

Compare the 41 mm Royal Oak Chronographs, every Royal Oak Chronograph reference we source, black-dial Royal Oaks, steel Royal Oaks and the 26240ST, or browse the Royal Oak and the full Audemars Piguet collection.

Specifications

How sourcing works

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