Audemars Piguet
Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02
The Audemars Piguet Royal Oak Selfwinding Chronograph 41 (reference 26331BA.OO.1220BA.02) is a 41 mm 18k yellow gold watch with a green dial. It runs on the automatic caliber 2385 with a 40-hour power reserve and is water resistant to 50 m.
Specifications
Case
- Reference
- 26331BA.OO.1220BA.02
- Collection
- Royal Oak
- Case size
- 41 mm
- Thickness
- 11 mm
- Case material
- 18k yellow gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- Integrated bracelet, 18k yellow gold
Dial and bezel
- Dial
- Green
- Bezel
- Octagonal, screwed
Movement
- Movement
- Automatic
- Caliber
- 2385 (base Frédéric Piguet 1185)
- Power reserve
- 40 hours
- Frequency
- 21,600 vph
- Jewels
- 37
- Functions
- Chronograph, Date, Small seconds
How it compares within the Royal Oak family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 26331BA.OO.1220BA.02 (This watch) | 41 mm | 18k yellow gold | Green | 2385 | — |
| 15510ST.OO.1320ST.10 | 41 mm | Stainless steel | Grey | 4302 | 2023– |
| 16202XT.OO.1240XT.01 | 39 mm | Titanium and bulk metallic glass | Red | 7121 | 2023– |
| 26240BC.GG.1324BC.02 | 41 mm | White gold | Blue | 4401 | 2023– |
| 26240BC.OO.1320BC.01 | 41 mm | White gold | Purple | 4401 | 2023– |
| 26240BC.OO.1320BC.04 | 41 mm | White gold | Blue | 4401 | 2025– |
| 26240BC.SS.1320BC.01 | 41 mm | White gold | Blue | 4401 | 2023– |
| 26585XT.OO.1220XT.01 | 41 mm | Titanium / BMG | Skeleton | 5135 | 2025– |
| 26586XT.OO.1240XT.01 | 41 mm | Titanium / BMG | Pink | 5133 | 2026– |
About the Royal Oak family
The Royal Oak was introduced in 1972 with ref. 5402, a steel watch designed by Gérald Genta with an octagonal bezel held by eight hexagonal screws, a Tapisserie-patterned dial and an integrated bracelet. It established the idea of a luxury sports watch in steel.
The extra-thin 39 mm models, such as ref. 15202 and the ref. 16202 of 2022 with caliber 7121, are the direct descendants of the original. Other key families include the 41 mm Selfwinding 15500 and 15510, the chronographs such as ref. 26240, perpetual calendars such as ref. 26574 and many gold, ceramic and titanium versions. Dealers read the full reference to confirm case material and dial, and check for polishing, which can soften the case's sharp edges.
Quick answers
- What size is the Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02?
- The Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02 has a 41 mm case, 11 mm thick.
- What movement does the Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02 use?
- It uses the automatic caliber 2385, with a 40-hour power reserve.
- How water resistant is the Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02?
- It is water resistant to 50 metres.
- What is the Audemars Piguet Royal Oak Selfwinding Chronograph 41 26331BA.OO.1220BA.02 made of?
- The case is 18k yellow gold. Bracelet or strap: Integrated bracelet, 18k yellow gold.
Catalog facts checked September 2026.