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.
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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 STEEL 15450ST BLUE DIAL 37MM BOXES PAPERS
A 37mm Audemars Piguet Royal Oak Self Winding in stainless steel with a blue dial, purchased from an Audemars Piguet Boutique in 2018.
- Condition: Excellent Condition
- Bracelet size range: up to 6.75 inches wrist
- Package type: Complete Packages/Set (double boxes)
- Papers included: Yes
2005 Audemars Piguet Royal Oak 15300ST White Dial - Box and Papers
The Royal Oak, designed with a 39mm case size that is often worn slightly larger than traditional round watches. The white and steel case provides clean aesthetics, and the integrated bracelet has no slack.
- Condition: Very sharp
- Case Size: 39mm
- Bracelet Type: Integrated
- Wrist Fit: up to 7.5 inch
Audemars PIGUET ROYAL OAK 15510 STAINLESS STEEL BLUE NUIT DIAL 2023 FULL SET
A 2023 41mm Audemars Piguet Royal Oak self-winding stainless steel watch with a Bleu Nuit, Nuage 50 dial.
- Condition: Excellent, Unpolished Condition
- Diameter: 41mm
- Material: Stainless Steel
UNPOLISHED CASE MINT 2014 Audemars Piguet 15400ST Royal Oak 41mm with Box & Paper
A 2014 Audemars Piguet Royal Oak 41mm watch in excellent condition, featuring a stainless steel case and black dial.
- Condition: Excellent
- Case size: 41mm diameter
- Wrist size: 7 1/2 inches
Audemars Piguet Royal Oak Chronograph White Steel FULL SET MINT 26300ST
The Audemars Piguet Royal Oak Chronograph features a white Grande Tapisserie dial with three subdials, protected by a glare-proof sapphire crystal. It has an elegant stainless steel case with brushed and polished finishes and an iconic octagonal bezel secured with eight hexagonal screws.
- Condition: Mint
- Case size: 41mm diameter
- Materials: Stainless Steel
- Water resistance: 50m depth rating
Audemars Piguet Royal Oak Offshore Ref. 26405CE
The Audemars Piguet Royal Oak Offshore Ref. 26405CE features a 44mm black ceramic and titanium case, making it a unique addition to any collection.
- Case material: black ceramic and titanium
- Size: 44mm
Audemars Piguet Royal Oak Chronograph 26315ST Silver Dial with Box and Papers
This is an Audemars Piguet Royal Oak Chronograph with a silver dial, stainless steel case and bracelet. The watch features a 38mm case size and has been well-maintained showing only light wear from use.
- Condition: Excellent
- Case Size: 38mm
- Bracelet Length: 19 links
- Wrist Size Fit: up to 7 inches
Audemars Piguet Royal Oak 15450ST White Dial with Box and Papers
This Audemars Piguet Royal Oak 15450ST features a sharp 37mm unpolished case, stainless bezel, and silver grand tapisserie dial with matching original factory hands.
- Condition: Excellent
- Case diameter: 37mm
- Bracelet length: up to 17.5cm / 6.88"
- Box and papers included: yes
Audemars Piguet Royal Oak Double Balance Wheel Openworked 2024 15407ST 41mm
The Audemars Piguet Royal Oak Double Balance Wheel Openworked is a new, automatic men's watch featuring a steel case with a diameter of 41mm and water resistance up to 5 ATM.
- Condition: New
- Case material: Steel
- Bracelet material: Steel
- Case diameter: 41mm