Wristwatch · Tourbillon Chronograph

Audemars Piguet Jules Audemars Tourbillon Chronograph

Partially verified

This Audemars Piguet Jules Audemars Tourbillon Chronograph is a large wristwatch crafted in 18K white gold. Produced under reference 25909, the watch features a visible one-minute tourbillon regulator and a round-button chronograph with a 30-minute register. The white enamel dial is finished with luminous radial Arabic numerals and skeleton arrow hands, also featuring luminous tips. The watch is powered by the Caliber 2879-1, a rhodium-plated movement with fausses cotes decoration, comprising 30 jewels and a lateral lever escapement. The movement is fitted with a steel cage tourbillon with three equidistant polished steel arms and a monometallic balance adjusted to heat, cold, and five positions. The case is a three-body construction with a stepped bezel, straight lugs, and a transparent case back protected by sapphire crystals. The set is accompanied by an original box, magnifying glass, certificate, and instruction booklet.

The Audemars Piguet Jules Audemars Tourbillon Chronograph set, including the wristwatch, box, and associated documents. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: catalog.antiquorum.swiss
Category: Wristwatch · Tourbillon Chronograph
Maker / attribution: Audemars Piguet
Reference: 25909
Catalogue / lot identifier: 109
Source-reported date: post-1999
Source-reported place: Switzerland
Source-reported serial: E 50846

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Construction

The timepiece features a large, three-body case constructed from 18K white gold. It is designed with a stepped bezel and straight lugs, providing a distinct silhouette. The case is equipped with sapphire crystals on both the front and the transparent case back, which allows for visual access to the mechanical movement components. The watch is also paired with an 18K white gold deployant clasp.

The white enamel dial serves as a backdrop for the watch's complications. It is decorated with luminous radial Arabic numerals and paired with white gold skeleton arrow hands that incorporate luminous tips. A 30-minute chronograph register is situated at the 3 o'clock position, while the aperture for the one-minute tourbillon regulator is positioned at 6 o'clock, which also supports the seconds hand under a polished steel bridge.

Evidence for this section

“Three-body, solid, polished and brushed, stepped bezel, straight lugs, transparent case back, sapphire crystals.”
“White enamel with luminous radial Arabic numerals, 30-minute register at 3, aperture for the tourbillon regulator under a polished steel bridge at 6, carrying the seconds hand.”

Movement and Escapement

The watch is driven by the Caliber 2879-1 movement, which features rhodium-plated surfaces finished with fausses cotes decoration. The movement includes 30 jewels and utilizes a lateral lever escapement. As a complex horological feature, it incorporates a one-minute tourbillon regulator featuring a steel cage with three equidistant polished steel arms.

The mechanical regulation is handled by a monometallic balance that has been adjusted to heat, cold, and five positions. Additionally, the assembly uses a self-compensating Breguet balance spring to assist with chronometric accuracy.

Evidence for this section

“Cal. 2879-1, rhodium-plated, fausses cotes decoration, 30 jewels, lateral lever escapement with one-minute tourbillon regulator with steel cage and 3 equidistant polished steel arms”
“monometallic balance adjusted to heat, cold and 5 positions, self-compensating Breguet balance spring.”
“Movement: 3** Good Repair required, at buyer's expense”

Provenance and Documentation

This Jules Audemars Tourbillon Chronograph is offered as a complete set, accompanied by its original box, a magnifying glass, the certificate, and an instruction booklet. The watch, movement, and case are all signed by Audemars Piguet. According to the provided information, production for this reference began in 1999.

The watch is identified by movement number 505266 and case number E 50846. The auction description reports the case condition as "As new" and the dial condition as "As new," while noting the specific requirement for movement repair.

Evidence for this section

“Accompanied by the original box, magnifying glass, certificate and instruction booklet.”
“Production of this reference started in 1999.”
“Dial, case and movement signed.”

Open research questions

What specific repair is required for the movement to function according to factory standards?
Does the '505266' movement number correlate to a specific production year between 1999 and the present?

Source evidence

Recorded claims and source quotations for Audemars Piguet Jules Audemars Tourbillon Chronograph
Field	Source-reported value	Source quotation
Maker	Audemars Piguet	“Audemars Piguet, Genève”
Reference	25909	“Ref. 25909”
Movement Number	505266	“movement No. 505266”
Case Number	E 50846	“case No. E 50846”
Caliber	2879-1	“Cal. 2879-1”
Case Dimensions	43 mm diameter, 13 mm thickness	“Diam. 43 mm. Thickness 13 mm.”
Case Material	18K white gold	“18K white gold wristwatch”
Movement Condition	Requires repair	“Movement: 3** Good Repair required”

Visible details

White enamel dial with Arabic numerals and a 30-minute counter at the 3 o'clock position.
Tourbillon carriage with three arms located at 6 o'clock.
Three-body case construction featuring a stepped bezel design.
Transparent case back allowing view of the rhodium-plated movement.

Research qualifications

The movement is noted by the auction house as requiring repair.
The exact production year within the post-1999 reference range is not specified.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

AP Jules audemars Tourbillon Chronograph Audemars Piguet, Genève, "Jules Audemars Tourbillon Chronograph", movement No. 505266, case No. E 50846, Ref. 25909. Production of this reference started in 1999. Very fine and rare, large, 18K white gold wristwatch with visible one-minute tourbillon regulator, round button chronograph, register and an 18K white gold Audemars Piguet deployant clasp. Accompanied by the original box, magnifying glass, certificate and instruction booklet.

Reviewed 2026-10-26 · Record 76b1fb9be1

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Glossary explanations for terms named in this object’s record.