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
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Vintage Seiko Sports 150 – Alarm Chronograph – 😏 “Poor Man’s AP Royal Oak” 😏 – 7T34-7A10 – $245 Shipped
This vintage Seiko Sports 150 is a quartz-powered chronograph with date display and alarm functions, housed in an approximately 44mm case.
- Condition: Poor condition with signs of wear and fading
- Case size: approximately 44mm diameter
- Bracelet length supported: up to 8 inches
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Audemars Piguet Royal Oak Offshore Chronograph 42mm Champagne Gold Dial 26470OR.OO.A002CR.01 "Half Brick”
This listing is for an Audemars Piguet Royal Oak Offshore Chronograph with a champagne gold dial, 42mm case size, and various other features. The watch is described as being in very good condition, with minor flaws noted. Additional details are available upon request.
- Condition: Very good, with minor marks and wear
- Material: Gold
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Audemars Piguet Royal Oak Offshore Selfwinding Chronograph Ceramic Rose Gold Grey Dial 44mm Box & Papers 26405NR.OO.A002CA.01
This Audemars Piguet Royal Oak Offshore Selfwinding Chronograph Ceramic Rose Gold Grey Dial is a 44mm rose gold and black ceramic masterpiece with a smoked grey dial, featuring a chronograph, date, small seconds, and water resistance of 100m.
- Condition: like new
- Case size: 44mm diameter
- Case material: ceramic
- Bezel material: 18k rose gold
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[US] Audemars Piguet Royal Oak ‘Jumbo’ Blue Dial 39mm Stainless Steel 15202st - $63,500
This listing is for a used Audemars Piguet Royal Oak 'Jumbo' with a blue dial, made of stainless steel. The watch features a 39mm case size.
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Audemars Piguet Royal Oak Offshore 15710ST Complete Set w/Box and Papers
This Audemars Piguet Royal Oak Offshore is a stainless steel watch with a white Mega Tapisserie dial and iconic octagonal bezel. It features an automatic Caliber 3120 movement, approximately 60-hour power reserve, and 300m water resistance.
- Condition: Excellent Pre-Owned Condition
- Case material: stainless steel
- Dial type: white Mega Tapisserie
- Bezel material: stainless steel with exposed hexagonal screws
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2024 Audemars Piguet Royal Oak Chronograph 26240CE — Brand New Condition, Box & Papers
The Audemars Piguet Royal Oak Chronograph showcases the iconic Royal Oak design executed in full black ceramic, delivering a bold yet refined presence. Featuring the signature “Grande Tapisserie” dial and in-house flyback chronograph movement, it blends cutting-edge materials with AP’s legendary craftsmanship.
- Condition: Brand new
- Case Material: Full black ceramic
- Diameter: 41mm
- Lug To Lug: 51.4mm
![[WTS] 2023 Audemars Piguet Royal Oak Offshore Chrono 42mm 26238ST Blue Dial - $39,850](https://preview.redd.it/85xkb6k9j3kg1.png?width=640&crop=smart&auto=webp&s=5ddf031e0a3d5b35a1b7a8745d52060bd1b6677b)
2023 Audemars Piguet Royal Oak Offshore Chrono 42mm 26238ST Blue Dial - $39,850
The seller is listing a 2023 Audemars Piguet Royal Oak Offshore Chronograph in stainless steel with a blue dial and black counters.
- Condition: Excellent overall condition
- Case size: 42mm diameter
- Material: Stainless Steel
- Strap material: Blue rubber and Black Calfskin leather
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Audemars Piguet Royal Oak Offshore Bleu Nuit Nuage 50 26238CD.OO.1300CD.01 Complete Set
This Audemars Piguet Royal Oak Offshore Bleu Nuit Nuage 50 is a brand-new 2025 release with a bold design and unmistakable Offshore character, featuring a blue ceramic build and 42 mm case.
- Condition: Like new
- Case size: 42 mm
- Case material: Blue ceramic with titanium caseback
- Bezel material: Ceramic
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