Audemars Piguet Royal Oak Royal Oak Perpetual Calendar Openworked Yellow Gold

Reference 25829BA.OO.0944BA.01

About this watch

The Audemars Piguet Royal Oak Perpetual Calendar Openworked Yellow Gold is a masterpiece of luxury watchmaking, boasting an exquisite design, intricate mechanics, and luxurious materials. This stunning timepiece tells a story through its openworked dial, showcasing the AP 2120 / 2802 caliber's reliability and precision. The perpetual calendar automatically accounts for varying month lengths and leap years, while the moonphase indicator adds celestial charm. Meticulous craftsmanship is evident in the manual finishing of bridges, including polished bevels and satin-brushed edges. The open case back offers a captivating view of the movement's inner workings, featuring an oscillating weight beautifully engraved and decorated. With its 39mm diameter, 9.30mm height, and water resistance of 20 meters, this watch strikes a perfect balance between substance and comfort. It's a statement of luxury and an heirloom that can be passed down through generations.
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Key Features

  • Audemars Piguet caliber AP 2120 / 2802 movement
  • Perpetual calendar with automatic date adjustment
  • Moonphase indicator with Physical Vapor Deposited metal on sapphire
  • Yellow gold case with polished and satin-brushed finishes
  • Openworked dial with Feuille hands
  • Water resistance of 20 meters
  • Sapphire crystal glass

Specifications

Brand
Audemars Piguet
Family
Royal Oak
Model
Royal Oak Perpetual Calendar Openworked Yellow Gold
Reference
25829BA.OO.0944BA.01
Movement
ap-2120-2802
Movement Features
  • Hours, Minutes
  • Date, Day, Leap Year, Month, Perpetual Calendar
  • Moonphase
Case
Yellow Gold 39mm
Dial Color
See-through
Crystal
Sapphire
Water Resistance
20

Current Listings

[WTS] 2020 Audemars Piguet Royal Oak Offshore Diver – "ADMIRAL" – Ref. 15710ST.OO.A010CA.01

2020 Audemars Piguet Royal Oak Offshore Diver – "ADMIRAL" – Ref. 15710ST.OO.A010CA.01

The Audemars Piguet Royal Oak Offshore Diver features a 42mm stainless steel case with the signature Royal Oak Offshore architecture and integrated crown guards.

  • Condition: Pre-owned, recently serviced
  • Case Size: 42mm diameter
  • Case Material: Stainless Steel
  • Dial Color: White with Blue Accents
Posted at
Apr 16, 2026, 5:30 PM
Active
[WTS] 2015 Audemars Piguet Royal Oak Offshore 26470ST “Safari” Full Set - Extra Strap $21,075

2015 Audemars Piguet Royal Oak Offshore 26470ST “Safari” Full Set - Extra Strap $21,075

The Audemars Piguet Royal Oak Offshore 'Safari' features a warm ivory dial with brown subdials and a matching brown strap, creating a rugged yet refined look.

  • Condition: Excellent pre-owned condition
  • Case Size: 42mm diameter
  • Movement: Automatic Chronograph
  • Dial: Ivory 'Méga Tapisserie' with brown subdials
Posted at
Apr 16, 2026, 3:11 PM
Active
[WTS] Audemars Piguet Royal Oak Offshore “Vampire” 26470ST 2017 Papers + AP Case + extra strap $20,599

Audemars Piguet Royal Oak Offshore “Vampire” 26470ST 2017 Papers + AP Case + extra strap $20,599

Audemars Piguet - 26470ST · $20,599
The 'Vampire' Royal Oak Offshore configuration features a deep black dial, bold red accents, and ceramic bezel for an aggressive look. This 2017 example presents well with Audemars Piguet papers, AP case, and multiple strap options.

  • Condition: Excellent pre-owned condition
  • Case Size: 42mm
  • Case Material: Stainless Steel
  • Movement: Automatic Chronograph
Posted at
Apr 16, 2026, 3:07 PM
Active
[WTS] Audemars Piguet Royal Oak Offshore Titanium "Beast" 25721TI - Full Set with Box & Papers

Audemars Piguet Royal Oak Offshore Titanium "Beast" 25721TI - Full Set with Box & Papers

The seller is listing a black dial Audemars Piguet Royal Oak Offshore 'Beast' in titanium that they purchased from eBay but don't want due to it being too big on their wrist. It comes as a full set with box and papers.

  • Condition: Good
  • Case material: Titanium
  • Bracelet material: Titanium
  • Size: 42mm diameter
Posted at
Apr 15, 2026, 8:19 PM
Active
[WTS] Audemars Piguet Royal Oak Offshore 26170ST, 2011 $15.4k

Audemars Piguet Royal Oak Offshore 26170ST, 2011 $15.4k

Audemars Piguet - 26170ST · $15,400
This is a Royal Oak Offshore watch from Audemars Piguet, with a stainless steel case and a sporty design. It features a 2011 model reference number 26170ST.

  • Condition: Preowned
  • Shipping: $100 + tariffs/duties included in price
  • Payment Methods: Wire or Credit Card (+4.9% & 4 days clearance)
  • References: 290+ verified sales, @worthytimeholdings on Instagram, Worthytime Holdings on Google page, and u/pacodo on r/tudor
Posted at
Apr 15, 2026, 10:36 AM
Active
[WTS] 2023 Audemars Piguet Royal Oak Offshore Diver, Blue Dial 15720ST — Like New Condition, Box & Papers

2023 Audemars Piguet Royal Oak Offshore Diver, Blue Dial 15720ST — Like New Condition, Box & Papers

Audemars Piguet - 15720ST · $25,000
The Audemars Piguet Royal Oak Offshore Diver combines the rugged Offshore aesthetic with refined finishing, featuring a vibrant blue dial and an inner rotating dive bezel. It has a stainless steel case paired with AP's interchangeable strap system and an in-house automatic movement for reliable performance.

  • Condition: Like new condition
  • Case diameter: 42mm
  • Lug to lug: 52mm
  • Thickness: 14.2mm
Posted at
Apr 15, 2026, 9:34 AM
Active
[WTS] 2013 Audemars Piguet Royal Oak Chronograph 42mm 26170ST — Excellent Condition, Box & Papers

2013 Audemars Piguet Royal Oak Chronograph 42mm 26170ST — Excellent Condition, Box & Papers

Audemars Piguet - 26170ST · $20,500
The Audemars Piguet Royal Oak Chronograph 42mm features a crisp white dial, blue chronograph subdials, and a stainless steel case with an octagonal bezel. This watch has a bold and iconic design, combining sport and practicality.

  • Condition: Excellent condition with light signs of wear
  • Case size: 42mm diameter
  • Lug to lug: 54mm
  • Thickness: 14mm
Posted at
Apr 14, 2026, 9:39 AM
Active
[WTS] Audemars Piguet Royal Oak Tourbillon Chronograph 44mm 26377SK.OO.D002CA.01 Complete Set

Audemars Piguet Royal Oak Tourbillon Chronograph 44mm 26377SK.OO.D002CA.01 Complete Set

This 44mm Royal Oak Tourbillon Chronograph features a black 'Méga Tapisserie' dial and exposed tourbillon at 6 o'clock, with a rubber-clad bezel providing an industrial contrast against the brushed stainless steel case.

  • Condition: Excellent condition with little to no signs of wear
  • Case size: 44mm
  • Case thickness: 13.2mm
  • Movement caliber: 2889
Posted at
Apr 13, 2026, 8:22 AM
Active
[WTS] Audemars Piguet Royal Oak Offshore Chronograph, 26170ST.OO.D101CR.03 ♦️Lightly Used Undated♦️

Audemars Piguet Royal Oak Offshore Chronograph, 26170ST.OO.D101CR.03 ♦️Lightly Used Undated♦️

This is a black dial Audemars Piguet Royal Oak Offshore Chronograph, a model known for its sporty and elegant design, featuring a rubber strap with a DB buckle.

  • Condition: Lightly Used
  • Band type: Rubber
  • Buckle type: DB buckle
Posted at
Apr 13, 2026, 3:36 AM
Active