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The Encyclopedia of Horology

Wristwatch · Manual-winding wristwatch

Greubel Forsey Double Tourbillon 30° No. 24

Partially verified

This Greubel Forsey Double Tourbillon 30° is an 18K white gold manual-winding wristwatch, identified as piece number 24 from the production series. The timepiece features a complex regulator mechanism consisting of a 30° inclined inner tourbillon carriage that completes a rotation every 60 seconds, housed within an outer tourbillon carriage that rotates every four minutes. Complications include a subsidiary seconds dial positioned at 9 o'clock, a 72-hour power-reserve indicator at 3 o'clock, and a transparent caseback. The movement, caliber GF02, is housed in a 43.5mm white gold case. The watch is presented with a leather strap and a white gold pin buckle, accompanied by an owner's book, certificate of authenticity, an extra strap, and a loupe.

Front view of the Greubel Forsey Double Tourbillon 30° showing the dial layout and tourbillon aperture.
Front view of the Greubel Forsey Double Tourbillon 30° showing the dial layout and tourbillon aperture. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Manual-winding wristwatch
Maker / attribution
Greubel Forsey
Reference
Not recorded
Catalogue / lot identifier
374
Source-reported date
circa 2004
Source-reported place
Not established
Source-reported serial
00 574/24

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

Movement Architecture

The movement of the Double Tourbillon 30° is calibrated as the GF02, a manual-winding caliber. Its primary feature is a double tourbillon configuration. The inner tourbillon cage is inclined at an angle of 30 degrees and completes a full rotation every 60 seconds. This assembly is mounted within an outer carriage that rotates once every four minutes, indicated by a specialized rotation indicator on the dial.

This architecture is designed to address positional errors in timekeeping by averaging the influence of gravity on the balance wheel. The movement is visible through a transparent caseback and includes a 72-hour power-reserve function, displayed via an indicator on the main dial.

Evidence for this section
  • “a double tourbillon mechanism with one cage inclined at 30° rotating in 60 seconds inside another cage completing a revolution every four minutes.”
  • “visible outer four-minutes tourbillon regulator with four minutes rotation indicator”
  • “72-hour power-reserve indication at 3”

Case and Dial

The timepiece is constructed with an 18K white gold case measuring approximately 43.5mm in diameter. The design includes visible engravings along the case flanks, which distinguish the exterior construction. The dial features a subsidiary seconds dial located at the 9 o'clock position and a power-reserve scale positioned at 3 o'clock.

The primary dial layout integrates Roman numeral markers and a prominent aperture at the 6 o'clock position, allowing for the mechanical operation of the tourbillon carriages to be observed directly from the front of the watch. The hands are manufactured from blued steel.

Evidence for this section
  • “18K white gold manual winding wristwatch”
  • “Diameter 43.5mm.”
  • “subsidiary dial for the seconds at 9, 72-hour power-reserve indication at 3”

Provenance and Documentation

This specific watch is identified as number 24 of the initial series produced by the manufacture. Greubel Forsey was founded in 2004, and this model is described as an inaugural creation. Between 2004 and 2010, a total of 144 examples were produced across variations in pink gold, white gold, and platinum.

The watch is accompanied by an owner's book containing a certificate of authenticity signed by Robert Greubel and Stephen Forsey. Additionally, the auction description notes that the lot includes service rights certificates and a fitted presentation box. The case and movement are both signed by the manufacturer.

Evidence for this section
  • “represents the inaugural creation of master watchmakers Robert Greubel and Stephen Forsey”
  • “Number 24, made in 18K white gold, is part of the extremely limited original production series”
  • “Signature dial, case and movement”

Open research questions

  • What is the specific total count of white gold variants among the 144 total pieces produced?
  • Are there variations in the engraving patterns on the case sides across the 2004-2010 production run?

Source evidence

Recorded claims and source quotations for Greubel Forsey Double Tourbillon 30° No. 24
FieldSource-reported valueSource quotation
MakerGreubel Forsey“GREUBEL FORSEY”
ModelDouble Tourbillon 30°“Double Tourbillon 30°”
Serial Number00 574/24“Case No. 00 574/24”
CaliberGF02“Caliber GF02”
Diameter43.5mm“Diameter 43.5mm.”
Weightapprox. 140gr.“Weight 140gr.(approx.)”
Total production144 pieces between 2004 and 2010“only 144 pieces created between 2004 and 2010”
ComplicationDouble tourbillon mechanism“a double tourbillon mechanism with one cage inclined at 30° rotating in 60 seconds inside another cage completing a revolution every four minutes.”

Visible details

  • Blue steel hands
  • Engraved case side detailing
  • Subsidiary seconds dial at 9 o'clock
  • Tourbillon carriage visible through aperture

Research qualifications

  • The exact month of production within 2004 is not stated.
  • The long-term functional efficacy of the service rights certificate is not verified.

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

Consulted source

GREUBEL FORSEY, DOUBLE TOURBILLON 30°, NO. 24, 18K WHITE GOLD

Reviewed 2026-10-26 · Record 8df654dced

Terms in this record

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

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