Audemars Piguet Royal Oak Royal Oak Perpetual Calendar Openworked

Reference 26685XT.OO.1320XT.01

Audemars Piguet Royal Oak Perpetual Calendar Openworked

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

[WTS] Audemars Piguet Royal Oak Grande Tapisserie 26315OR.ZZ.1256OR.01 ♦️Lightly Used 2021♦️

Audemars Piguet Royal Oak Grande Tapisserie 26315OR.ZZ.1256OR.01 ♦️Lightly Used 2021♦️

Audemars Piguet - 26315OR.ZZ.1256OR.01 · $81,300
The Audemars Piguet Royal Oak Grande Tapisserie is a high-end watch with a distinctive tapisserie dial pattern, made in 2021.

  • Condition: Lightly Used
  • Year of production: 2021
  • Calibre: Calibre 65
  • Box and papers included: yes
Posted at
May 19, 2026, 2:44 AM
Active
View listing on r/WatchExchange
[WTS] 🌐Audemars Piguet Royal Oak Offshore Diver🔷 – White Dial Navy Accents – Ref. 15710ST.OO.A010CA.01

🌐Audemars Piguet Royal Oak Offshore Diver🔷 – White Dial Navy Accents – Ref. 15710ST.OO.A010CA.01

Audemars Piguet - 15710ST.OO.A010CA.01 · $19,198
The Audemars Piguet Royal Oak Offshore Diver is a bold luxury sports watch that combines high-end Swiss watchmaking with true professional dive capability, featuring a 42mm stainless steel case and a white dial with blue accents.

  • Condition: Pre-owned (serviced)
  • Case size: 42mm diameter
  • Case material: stainless steel
  • Dial color: white with blue accents
Posted at
May 18, 2026, 4:50 PM
Active
View listing on r/WatchExchange

Audemars Piguet Royal Oak Offshore Diver – White Dial Navy Accents – Ref. 15710ST.OO.A010CA.01 COMPLETE SET

Audemars Piguet - 15710ST.OO.A010CA.01 · $19,598
The Audemars Piguet Royal Oak Offshore Diver is a luxury sports watch with true professional dive capability and a bold design. It features a 42mm stainless steel case, white dial, internal rotating dive bezel, and automatic movement.

  • Condition: just serviced and running flawlessly
  • Case size: 42mm diameter
  • Case material: stainless steel
  • Dial description: white with blue accents
Posted at
May 18, 2026, 1:56 PM
Active
View listing on r/WatchExchange
[WTS] Audemars Piguet Royal Oak Jumbo 15202ST ♦️Lightly Used Undated♦️

Audemars Piguet Royal Oak Jumbo 15202ST ♦️Lightly Used Undated♦️

Audemars Piguet - 15202ST · $69,800
A lightly used Audemars Piguet Royal Oak Jumbo, available for sale. This watch is undated and comes with a full set including box and papers.

  • Condition: Lightly Used
  • Calibre: Calibre 65
  • Payment Methods: Bank Wire / Credit card (+4.9%) / Crypto
  • Shipping Details: Shipped from Singapore with tariffs/duties covered by seller
Posted at
May 18, 2026, 4:16 AM
Active
View listing on r/WatchExchange
[WTS] Audemars Piguet Royal Oak Offshore Limited Edition 26290RO.OO.A001VE.01 ♦️Lightly Used 2010♦️

Audemars Piguet Royal Oak Offshore Limited Edition 26290RO.OO.A001VE.01 ♦️Lightly Used 2010♦️

Audemars Piguet - 26290RO.OO.A001VE.01 · $50,000
Audemars Piguet Royal Oak Offshore Limited Edition from 2010, a unique and special timepiece.

  • Condition: lightly used
Posted at
May 18, 2026, 3:21 AM
Active
View listing on r/WatchExchange
[WTS] 1995 Audemars Piguet Royal Oak 120th Anniversary LE ref. 56975ST w/ Box & Extract

1995 Audemars Piguet Royal Oak 120th Anniversary LE ref. 56975ST w/ Box & Extract

Audemars Piguet - 56975ST · $21,800
This 1995 Audemars Piguet Royal Oak 120th Anniversary LE is a limited edition watch with a stainless steel case and blue dial. The watch features a quartz movement and comes with its original box and extract from the archives.

  • Condition: Minimal wear, excellent condition overall
  • Case material: Stainless steel
  • Diameter: 33mm
  • Lug width: 23.5mm
Posted at
May 17, 2026, 5:19 PM
Active
View listing on r/WatchExchange
[WTS] Audemars Piguet Royal Oak Offshore Chronograph

Audemars Piguet Royal Oak Offshore Chronograph

Audemars Piguet - Royal Oak Offshore Chronograph · $48,000
  • Price: $48,000
Posted at
May 17, 2026, 12:54 PM
Active
View listing on r/WatchExchange
[WTS] [WTT] Audemars Piguet Royal Oak Selfwinding 39mm Black Dial 15300ST.OO.1220ST.03 - 9.9/10 - $34,500

[WTT] Audemars Piguet Royal Oak Selfwinding 39mm Black Dial 15300ST.OO.1220ST.03 - 9.9/10 - $34,500

Audemars Piguet - 15300ST.OO.1220ST.03 · $34,500
A 2014 Audemars Piguet Royal Oak Selfwinding 39mm black dial watch in remarkable shape for its age, featuring a fully in-house movement and Genta-designed case.

  • Condition: 9.9/10 - virtually flawless with exceptional case and bracelet sharpness
  • Year: 2014
  • Case Condition: remarkable shape for a 2014 piece
Posted at
May 16, 2026, 2:30 PM
Active
View listing on r/WatchExchange
[WTS] Audemars Piguet Royal Oak Chronograph Blue Dial 26320ST

Audemars Piguet Royal Oak Chronograph Blue Dial 26320ST

Audemars Piguet - 26320ST · $45,000
This Audemars Piguet Royal Oak Chronograph features a blue dial and comes with an OEM bracelet. It has a caliber 2385 automatic movement and is water resistant to 50M.

  • Condition: Very Good, minor signs of use on the case and minor patina/discoloration around the subdials
  • Case size: 41mm diameter
  • Lug to lug length: 52mm
  • Movement type: caliber 2385 automatic
Posted at
May 16, 2026, 1:33 PM
Active
View listing on r/WatchExchange