Audemars Piguet Tourbillon Automatique Ref. 25 643 BA
Record status
Individual type · partial
Period
circa 1990
Maker / issuer
Audemars PiguetThis Audemars Piguet Tourbillon Automatique, identified as number 186, is a self-winding gentleman's wristwatch featuring a vertical elliptical-shaped 18K yellow gold case measuring 35.2 x 28.7 mm.
Produced circa 1990, the timepiece is powered by the extra-thin Calibre 2870 movement, which utilizes the inside of the case-back as the main-plate. The movement incorporates a one-minute tourbillon regulator, a titanium tourbillon carriage, and a platinum-iridium pendulum oscillating mass. Additional technical features include a going barrel, a lateral lever escapement, a Glucydur screw-balance, and a self-compensating flat hairspring.
The dial is signed by the manufacturer, and the watch is fitted with an Audemars Piguet brown leather strap and an 18K yellow gold deployant clasp. The watch is presented with its original fitted box. Time setting is achieved via the back of the case.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Type
- Tourbillon wristwatch
- Year
- circa 1990
- Maker
- Audemars Piguet
- Calibre
- 2870
- Functions
- One-minute tourbillon, self-winding
- Reference
- 25 643 BA
- Dimensions
- 35.2 x 28.7 mm
- Case Material
- 18K yellow gold
- Place recorded
- Switzerland
- Movement Serial
- 186
- Maker / attribution
- Audemars Piguet
Design
- Case and Dial
- The watch is housed in a vertical elliptical case crafted from 18K yellow gold, measuring 35.2 x 28.7 mm. The design includes a unique time-setting mechanism located on the back of the case rather than through a traditional crown. The dial features a decorative radiating guilloche pattern with the Audemars Piguet signature. An aperture at the upper left position exposes the one-minute tourbillon regulator, while the lower section of the dial provides a view of the oscillating mass component.
- Visible features
- • Vertical elliptical-shaped yellow gold case • Visible tourbillon cage positioned at the upper left of the dial • Guilloche radiating pattern on the dial surface • Signed Audemars Piguet on the dial
- Movement and Construction
- The movement is the extra-thin self-winding Calibre 2870. The construction is notable for using the inside of the case-back as the main-plate. Technical components include a titanium tourbillon carriage and a platinum-iridium pendulum oscillating mass. The assembly also contains a lateral lever escapement, a Glucydur screw-balance, and a self-compensating flat hairspring.
- Condition and Authenticity
- The auction description reports the watch to be in excellent condition under their internal grading system, although the movement is noted as requiring an overhaul. The case exhibits minor surface wear. The watch is accompanied by its original fitted box. Signatures are verified on the dial, case, and movement.
Identification
- Reference
- 25 643 BA
- Serial number
- 186
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: Condition of the movement is described as needing an overhaul
- Research required: General grading system reports slight scratches on the case