Skip to content
The Encyclopedia of Horology

Wristwatch · Tourbillon wristwatch

Greubel Forsey Tourbillon 24 Secondes Incliné 18k White Gold Wristwatch

Partially verified

This Greubel Forsey wristwatch, catalogued as dating to circa 2009 with case number 77, showcases an asymmetric 18k white gold case measuring 43.5 mm in diameter. Designed to accommodate the maker's inclined tourbillon system angled at 25 degrees, the case incorporates a lateral caseband aperture near 7 o'clock. Its dark grey or black gold dial features central hours and minutes, an overlapping small seconds sector, and a power reserve indicator inscribed 'RÉSERVE DE MARCHE' graduated up to 72 hours. The movement is Greubel Forsey's 36-jewel manual-winding caliber GF01, and the watch is fitted with a brown leather strap and an 18k white gold double deployant buckle.

Greubel Forsey Tourbillon 24 Secondes Incliné in an asymmetrical 18k white gold case with black gold dial.
Greubel Forsey Tourbillon 24 Secondes Incliné in an asymmetrical 18k white gold case with black gold dial. — Christie's. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
onlineonly.christies.com
Category
Wristwatch · Tourbillon wristwatch
Maker / attribution
Greubel Forsey
Reference
Not recorded
Catalogue / lot identifier
23
Source-reported date
circa 2009
Country
Switzerland
Source-reported serial
77

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

Identity and Case Construction

Catalogued under case number 77 and dated circa 2009, this Greubel Forsey wristwatch is housed in an 18k white gold asymmetric case measuring 43.5 mm in diameter. Visually, an asymmetrical bulge extends along the bezel and caseband between the 7 and 9 o'clock positions to fit the inclined tourbillon assembly.

The cataloguing notes that the 18k white gold caseband incorporates an aperture near the 7 o'clock position to afford lateral viewing into the escapement. The watch is fitted with a brown leather strap and an 18k white gold double deployant buckle.

Evidence for this section
  • “CASE NUMBER: 77”
  • “CIRCA: 2009”
  • “DIAMETER: 43.5 mm.”
  • “Asymmetrical bulge on the bezel and caseband between the 7 and 9 o'clock positions accommodating the inclined tourbillon assembly.”
  • “CASE MATERIAL: 18k white gold with an aperture on the caseband near the 7 o’ clock position”
  • “BUCKLE: Greubel Forsey 18k white gold double deployant buckle”

Dial and Escapement Display

The dial is catalogued as a black gold dial and features an open aperture displaying the inclined tourbillon cage mounted beneath an arched transverse bridge with a jewel pivot. Inscriptions directly visible on the face include 'TOURBILLON 24° INCLINÉ', 'GREUBEL FORSEY', and 'SWISS MADE' near 6 o'clock.

Indications on the dial encompass central time, an overlapping subsidiary seconds register marked with dual concentric tracks and a blued tip pointer, and a curved power reserve sector inscribed 'RÉSERVE DE MARCHE' tracking up to 72 hours.

Evidence for this section
  • “DIAL: Black gold dial”
  • “Open dial aperture revealing the inclined tourbillon cage secured under an arched transverse bridge with jewel pivot.”
  • “Dial marked 'TOURBILLON 24° INCLINÉ', 'GREUBEL FORSEY', and 'SWISS MADE' at 6 o'clock.”
  • “Overlapping subsidiary seconds dial marked with dual concentric tracks and a blued tip pointer.”
  • “Curved sector inscribed 'RÉSERVE DE MARCHE' tracking up to 72 hours via an indicator hand.”

Mechanics and Accompanying Material

The movement is catalogued as Cal. GF01, a manual-winding mechanism featuring 36 jewels and a tourbillon escapement. The auction essay describes this system as Greubel Forsey's inclined tourbillon angled at 25 degrees.

The lot documentation lists accompanying items including an owner's book with a Certificate of Authenticity signed by Robert Greubel and Stephen Forsey, an International Warranty dated August 27th, 2009, product literature, a Moleskine notebook, jewelry gloves, a polishing cloth, a watch loupe, and presentation packaging.

Evidence for this section
  • “MOVEMENT: Cal. GF01, manual-winding, 36 jewels, tourbillon escapement”
  • “a completely new tourbillon system that was inclined at 25 degrees and completed a revolution in 24 degrees.”
  • “WITH: Owner’s book with Certificate of Authenticity signed by Robert Greubel and Stephen Forsey and International Warranty dated August 27 th , 2009 product literature, Moleskine notebook, jewellery gloves, polishing cloth, watch loupe, presentation box and outer packaging”

Open research questions

  • What movement serial number, individual numbering, or finishing inscriptions appear on the plates visible through the caseback?
  • Does the lateral caseband window or sapphire caseback feature specific reference or patent engravings?
  • What are the precise timing measurements and amplitude across positions recorded for this GF01 caliber?

Source evidence

Recorded claims and source quotations for Greubel Forsey Tourbillon 24 Secondes Incliné 18k White Gold Wristwatch
FieldSource-reported valueSource quotation
Case Number77“CASE NUMBER: 77”
Case Material18k white gold“CASE MATERIAL: 18k white gold with an aperture on the caseband near the 7 o’ clock position”
Diameter43.5 mm“DIAMETER: 43.5 mm.”
CalibreCal. GF01“MOVEMENT: Cal. GF01, manual-winding, 36 jewels, tourbillon escapement”
Circa2009“CIRCA: 2009”
Buckle18k white gold double deployant buckle“BUCKLE: Greubel Forsey 18k white gold double deployant buckle”
Strap MaterialBrown leather strap“STRAP MATERIAL: Brown leather strap”
FunctionsTime, power reserve“FUNCTIONS: Time, power reserve”
Warranty DateAugust 27, 2009“International Warranty dated August 27 th , 2009”

Visible details

  • Asymmetrical bulge on the bezel and caseband between the 7 and 9 o'clock positions accommodating the inclined tourbillon assembly.
  • Open dial aperture revealing the inclined tourbillon cage secured under an arched transverse bridge with jewel pivot.
  • Curved sector inscribed 'RÉSERVE DE MARCHE' tracking up to 72 hours via an indicator hand.
  • Overlapping subsidiary seconds dial marked with dual concentric tracks and a blued tip pointer.
  • Dial marked 'TOURBILLON 24° INCLINÉ', 'GREUBEL FORSEY', and 'SWISS MADE' at 6 o'clock.

Research qualifications

  • Movement finishing and case back inscriptions are not visible in the provided dial view.
  • The lateral caseband aperture noted in the source description is obscured at this front photographic angle.

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

Consulted source

GREUBEL FORSEY, TOURBILLON 24 SECONDS INCLINE, A RARE ASYMMETRIC CASE GOLD MANUAL-WINDING WRISTWATCH, CASE NUMBER: 77 | Christie’s

Reviewed 2026-10-21 · Record b72081b02e

Terms in this record

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

Other tourbillon wristwatch records