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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Audemars Piguet Royal Oak Offshore 26470IO – Titanium/Ceramic – Box & Papers – Random Serial (2020+) – Great Condition – 26,800 Shipped – Trades Welcome
This Audemars Piguet Royal Oak Offshore Ref. 26470IO features a titanium case, gray ceramic bezel, and AP automatic chronograph movement, giving it a rugged yet luxurious presence.
- Condition: great
- Case material: titanium
- Bezel material: gray ceramic
- Movement type: AP automatic chronograph movement
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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 stylish and functional chronograph watch featuring date display, alarm functions, and powered by quartz movement. It's housed in an approximately 44mm case on its original bracelet.
- Condition: Used with signs of wear and fading
- Case Size: approximately 44mm
- Strap Length: up to 8 inches
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Audemars Piguet Royal Oak Offshore Diver “The Admiral”
The Audemars Piguet Royal Oak Offshore Diver 'The Admiral' features a 42mm case, white hobnail dial, and integrated strap with navy blue accents.
- Condition: Excellent Condition
- Case size: 42mm
- Water resistance: 200m depth rating
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Audemars Piguet Royal Oak 6014ba ($39,500)
This Audemars Piguet Royal Oak is a solid 18K gold watch with a quartz movement, suitable for a 7-inch wrist.
- Condition: really nice
- Material: solid 18K gold
- Wrist size compatibility: roughly 7 inch
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Audemars Piguet Royal Oak Offshore Selfwinding Chronograph Ceramic Rose Gold Grey Dial 44mm Box & Papers 26405NR.OO.A002CA.01
The watch is a 44mm rose gold and black ceramic Audemars Piguet Royal Oak Offshore Selfwinding Chronograph with a smoked grey dial.
- Condition: Like new
- Case size: 44mm
- Movement caliber: 3126/3840
- Power reserve: 50 hours
![[WTS] Audemars Piguet Royal Oak Offshore 26470IO – Titanium/Ceramic – Box & Papers – Random Serial (2020+) – Great Condition – 26,800 Shipped – Trades Welcome](https://preview.redd.it/4q7f0pj093jg1.jpg?width=640&crop=smart&auto=webp&s=b7498d1634ef2433aca43f02a9ce52c756de73e7)
Audemars Piguet Royal Oak Offshore 26470IO – Titanium/Ceramic – Box & Papers – Random Serial (2020+) – Great Condition – 26,800 Shipped – Trades Welcome
Up for sale is an Audemars Piguet Royal Oak Offshore Ref. 26470IO, one of the most striking modern Offshore configurations. The titanium case paired with the gray ceramic bezel gives this piece a rugged, stealth-luxury presence, while still wearing comfortably thanks to the lightweight build.
- Condition: Great
- Case Material: titanium
- Bezel Material: gray ceramic
- Movement: AP automatic chronograph movement
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Audemars Piguet Royal Oak 15300OR – Rose Gold - Watch Only
This Audemars Piguet Royal Oak reference 15300OR features a 39mm 18k rose gold case with a classic white Grande Tapisserie dial, powered by the in-house AP Calibre 3120 automatic movement. It comes with both a brown alligator leather strap and an additional white rubber strap for different wear options.
- Condition: Very good pre-owned condition
- Case Size: 39mm
- Material: 18k Rose Gold
- Dial: White “Grande Tapisserie”
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Audemars Piguet Royal Oak Offshore Diver 42mm Funky Green 15710ST.OO.A038CA.01
This Audemars Piguet Royal Oak Offshore Diver is a 42mm Funky Green timepiece with a stainless steel case and rubber band, featuring an automatic movement, sapphire crystal, and a water resistance of 300 meters. The watch comes with its outer box, inner green box, instruction manual, and warranty manual.
- Condition: Excellent pre-owned condition
- Case diameter: 42mm
- Water resistance: 300 meters
- Movement: Automatic
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Audemars Piguet Royal Oak Offshore Chronograph Jarno Trulli Limited Edition
This limited edition Royal Oak Offshore features a forged carbon fiber case, cermet bezel and other components, and an open display case back signed by F1 legend Jarno Trulli.
- Condition: Excellent condition with very few signs of wear
- Case material: Forged carbon fiber
- Bezel material: Cermet