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 Chronograph 41mm Rose Gold 26320OR Black Dial 2016 Fu
This Audemars Piguet Royal Oak Chronograph features a 41mm rose gold case and black dial, produced in 2016.
- Condition: Very Good
- Case size: 41mm diameter
- Year of production: 2016
Audemars Piguet Royal Oak Offshore Chronograph 42mm AP Vampire Ceramic Bezel �
This listing is for an Audemars Piguet Royal Oak Offshore Chronograph with a 42mm AP Vampire Ceramic Bezel, featuring a 26470ST reference number.
- Condition: Very Good
- Accessories: Original Box
- Shipping: Free, fully insured FedEx from Charlotte, NC
Audemars Piguet Royal Oak Offshore Chronograph 44mm Rose Gold Black Dial AP 264
This is a 44mm Audemars Piguet Royal Oak Offshore Chronograph with a rose gold case and black dial, produced in 2017.
- Condition: Very Good
- Case size: 44mm diameter
- Year of production: 2017
Audemars Piguet Royal Oak 41mm AP 15400or Rose Gold White Dial 2015 Full Set
This 2015 Audemars Piguet Royal Oak features a 41mm rose gold case with a white dial.
- Condition: Very Good
- Case size: 41mm
- Year: 2015
Audemars PIGUET 26401RO ROYAL OAK OFFSHORE 44MM WATCH
This Audemars Piguet Royal Oak Offshore watch features a 44MM case with ceramic bezel and pusher, coming in 18K Rose Gold with Black rubber band.
- Case size: 44mm
- Material: 18K Rose Gold
- Band material: Black rubber
2016 Audemars Piguet 15202ST Royal Oak w/ Full Set
The Royal Oak 15202ST is a 39mm stainless steel watch with a blue dial and integrated H-Link bracelet. It's the spiritual successor to the 5402, maintaining its ultra-thin height.
- Condition: Excellent
- Case size: 39mm diameter
- Material: Stainless Steel
- Dial color: Blue
Audemars Piguet 8638ST Tropical Royal Oak
The Audemars Piguet 8638ST Tropical Royal Oak is a rare and unique timepiece designed for female clients, featuring a small self-winding caliber and a tropical dial that has developed an even brown patina over time. Its production run was limited to approximately 3,889 timepieces between 1976 and 1990. This particular watch may appeal to those looking for a smaller Royal Oak.
- Condition: Excellent
- Diameter: 29mm
- Case material: Stainless Steel
2020 Audemars Piguet 15500ST Royal Oak 41mm Black with Box & Papers
2020 Audemars Piguet Royal Oak 41mm Black with Box & Papers, in excellent condition.
- Condition: Excellent
- Case Size: 41mm
- Material: Stainless Steel
- Dial Color: Black
SOLD FS: Audemars Piguet Royal Oak Jumbo YG 15202BA.OO.0944BA.01 Warranty
- Condition: warranty
- Material: yellow gold