Audemars Piguet Royal Oak Royal Oak Perpetual Calendar Openworked
Reference 26685XT.OO.1320XT.01
About this watch
The Audemars Piguet Royal Oak Selfwinding Perpetual Calendar 26685XT.OO.1320XT.01 debuted in 2026 as part of the Royal Oak collection, introducing the openworked perpetual calendar Calibre 7139 in a titanium and Bulk Metallic Glass (BMG) case configuration.
The watch is housed in a 41 mm case crafted from titanium, with the bezel and caseback executed in BMG. Case thickness measures 9.5 mm. Sapphire crystals are fitted on both the dial side and case back. Water resistance is rated to 50 metres. The integrated bracelet is manufactured from titanium with BMG links and secured by a three-blade folding clasp.
The dial is executed in sapphire, revealing the movement architecture. It is combined with matching subdials featuring a smoked outer zone and a black inner bezel. The display includes indications for hours, minutes, week, day, date, month, leap year, and astronomical moon. Hands and hour markers are crafted from 18-carat pink gold and filled with luminescent material.
Powering the watch is the selfwinding Calibre 7139. The movement operates at a frequency of 28,800 vibrations per hour (4 Hz), consists of 423 components, and contains 41 jewels. It measures 29.6 mm in diameter, has a thickness of 4.1 mm, and provides a power reserve of approximately 55 hours.
Buy Now on Jomashop
This is an affiliate link
Specifications
- Brand
- Audemars Piguet
- Family
- Royal Oak
- Model
- Royal Oak Perpetual Calendar Openworked
- Reference
- 26685XT.OO.1320XT.01
- Movement
- ap-7139
- Movement Features
-
- Hours, Minutes
- Date, Day, Leap Year, Month, Week Indicator
- Moonphase
- Skeleton
- Case
- 41mm
- Dial Color
- Skeleton
- Crystal
- Sapphire
- Water Resistance
- 20
Current Listings
Audemars Piguet Royal Oak Yellow Gold - 15300BA - White - Yellow Gold - 39mm
This Audemars Piguet Royal Oak Yellow Gold watch features a 39mm yellow gold case, white dial, and automatic date movement.
- Condition: Pre-Owned - Excellent Grade
- Case size: 39mm
- Material: Yellow Gold
- Dial: White
LNIB Audemars PIGUET ROYAL OAK 50TH ANNIVESARY 15550ST ICE BLUE DIAL 37MM 2022
2022 Audemars Piguet Royal Oak 50th Anniversary edition with a 37mm stainless steel case and ice blue dial.
- Condition: Like New in Box (LNIB)
- Case size: 37mm
- Diameter: 37mm
- Material: Stainless Steel
Audemars Piguet Royal Oak Offshore 15710ST.OO.A002CA.02
This is a Black Accents Audemars Piguet Royal Oak Offshore model, which comes as a complete set with original papers and box.
- Condition: Excellent condition
- Water Resistance: 100m
Audemars Piguet Royal Oak Offshore Diver Blue Dial Steel FULL SET MINT 15720ST
The Audemars Piguet Royal Oak Offshore Diver is a versatile watch suitable for diving adventures, with a precision timekeeping feature and water resistance up to 300 meters.
- Condition: Mint condition
- Water Resistance: 300m depth rating
- Luminous Hands: true
- Case Dimensions: not specified
Audemars Piguet Royal Oak Offshore Chronograph �Brick� Rare Yellow Gold Blue Di
This is a rare yellow gold Audemars Piguet Royal Oak Offshore Chronograph with a blue dial, featuring a 42mm case.
- Condition: Very Good
- Case size: 42mm
- Year of manufacture: 2019
Audemars Piguet Royal Oak Offshore Chronograph Smoked Taupe 43mm AP 26420SO - F
The Audemars Piguet Royal Oak Offshore Chronograph Smoked Taupe is a luxury watch featuring a 43mm case size, smoked taupe color, and chronograph functionality.
- Condition: Very Good
- Case Size: 43mm diameter
- Color: Smoked Taupe
Audemars Piguet Royal Oak Offshore Chronograph Gray Titanium FULL SET 26170TI
The Audemars Piguet Royal Oak Offshore Chronograph in Gray Dial is a lightweight titanium watch with a matte finish, designed for everyday use and featuring a stunning gray Mîga Tapisserie dial.
- Condition: Near mint condition
- Case material: titanium
- Diameter: 44mm
- Water resistance: 100m
Audemars Piguet Royal Oak Offshore �Brick Beast� Blue Dial FULL SET MINT 26238O
The Audemars Piguet Royal Oak Offshore Chronograph features a deep blue Petite Tapisserie dial with pink gold-toned counters and a brushed case. It showcases a transparent caseback revealing the intricate movement within.
- Condition: Mint
- Case size: 42mm
- Water resistance: 200m depth rating
- Movement: Chronograph
Audemars Piguet Royal Oak Offshore Chronograph 42mm Titanium Beast Black Dial -
This Audemars Piguet Royal Oak Offshore Chronograph features a 42mm titanium case, black dial, and is in very good condition.
- Condition: Very Good
- Case size: 42mm diameter
- Material: Titanium