Wristwatch · Jump-hour retrograde wristwatch

Gérald Genta Solo Birétro

Partially verified

This Gérald Genta Solo Birétro wristwatch, reference BSO.L.10, is a stainless steel self-winding timepiece dating to approximately 2006. The watch features a tonneau-shaped, curved case measuring 34 x 47 mm with a thickness of 11 mm. Its complex dial configuration includes a jump-hour aperture at the 12 o'clock position, a retrograde minute display with large Arabic numerals, and a secondary retrograde date sector at the bottom of the dial. The watch is powered by the rhodium-plated caliber GA3 movement, which utilizes a straight-line lever escapement and a monometallic balance with a shock-absorption system and hack mechanism. The case, which is water-resistant and secured by four screws, is matched with an integrated stainless steel bracelet featuring a concealed double deployant clasp. The watch is signed on the dial, case, and movement.

Front view of the Gérald Genta Solo Birétro showing the retrograde minute and date sectors. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: catalog.antiquorum.swiss
Category: Wristwatch · Jump-hour retrograde wristwatch
Maker / attribution: Gérald Genta
Reference: BSO.L.10
Catalogue / lot identifier: 155
Source-reported date: circa 2006
Source-reported place: Not established
Source-reported serial: 115680

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 Design

The Gérald Genta Solo Birétro is defined by its tonneau-shaped, curved stainless steel case. The construction of the three-body case includes concave sides and a rounded bezel, while the case back is secured by four screws. The watch measures 34 mm by 47 mm with a thickness of 11 mm. A corrector is positioned on the case band to adjust functions, and the winding crown is detailed with a border of small dots.

A jump-hour aperture is positioned at the top of the dial, while a large-scale retrograde minute sector occupies the upper half. Below this, a secondary retrograde sector is dedicated to the date. Large Arabic numerals define the minute track, and steel alpha hands are utilized for the time and date indications.

Evidence for this section

“Three-body, concave sides, rounded bezel, case back with 4 screws, winding crown edged with dots, sapphire crystal, corrector on the band.”
“Two tone silver with large Arabic numerals for the retrograde minutes sector, at 12, aperture for the jump-hour, at the bottom sector for the retrograde date. Steel alpha hand.”

Movement and Mechanical Features

Internally, the timepiece is driven by the caliber GA3 self-winding movement. This mechanism is finished with rhodium plating and contains 21 jewels. The movement utilizes a straight-line lever escapement and a monometallic balance. To ensure the performance of the jump-hour and retrograde functions, the caliber is equipped with a self-compensating flat balance spring, an integrated shock-absorption system, and a hack mechanism for precise time setting.

The movement is signed, consistent with the signature found on the dial and case. The components operate within the tonneau-shaped profile of the watch, providing the necessary torque and regulation for the multiple retrograde displays located on the dial face.

Evidence for this section

“M. Cal. GA3, rhodiumplated, 21 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, hack mechanism.”
“Dial, case and movement signed.”

Condition and Presentation

The auction house reports the condition of the watch according to a specific grading scale, where the watch is assigned an overall Grade A rating. Individual components have been assessed: the case is graded as 2 (very good), the movement is graded as 2 (very good), and the dial is described as 1-01 (as new). The original hands remain with the watch.

The watch is presented on a stainless steel Gérald Genta bracelet. This bracelet is integrated into the tonneau case design and features a concealed double deployant clasp. The total length of the watch and bracelet is approximately 210 mm. The auction description clarifies that the watch is to be sold without a reserve price.

Evidence for this section

“Grading System Grade: A Good Case: 2 Very good Movement: 2 Very good Dial: 1-01 As new HANDS Original”
“Approx overall length 210 mm.”
“To be sold without reserve”

Open research questions

What is the specific frequency of the Caliber GA3 movement?
Does the corrector on the case band specifically adjust the date or the jump-hour indication?

Source evidence

Recorded claims and source quotations for Gérald Genta Solo Birétro
Field	Source-reported value	Source quotation
Maker	Gérald Genta	“Gérald Genta”
Reference	BSO.L.10	“Ref. BSO.L.10”
Case Material	Stainless steel	“stainless steel wristwatch”
Dimensions	34 x 47 mm	“Dim. 34 x 47 mm”
Movement	Caliber GA3	“M. Cal. GA3”
Jewel count	21	“21 jewels”
Case number	115680	“case No. 115680”
Date	circa 2006	“Made circa 2006”

Visible details

Curved tonneau case shape
Retrograde minutes and date sectors
Dots along the edge of the winding crown
Integrated link bracelet

Research qualifications

Movement accuracy outside of standard grading observations
Actual water-resistance status unverified

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

Consulted source

Solo Birétro Gérald Genta, "Solo Birétro", case No. 115680, Ref. BSO.L.10. Made circa 2006. Fine, tonneau-shaped and curved, jumphour, self-winding, water-resistant, stainless steel wristwatch with retrograde minutes and retrograde date with a stainless steel Gérald Genta bracelet with concealed double deployant clasp. To be sold without reserve

Reviewed 2026-10-26 · Record 7551e0dcf0

Terms in this record

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