Wristwatch · Tourbillon world time wristwatch

Greubel Forsey GMT Sport Earth ‘Blue’ titanium world time tourbillon wristwatch

Partially verified

This Greubel Forsey GMT Sport Earth wristwatch features an ovoid titanium case measuring 45 mm in diameter fitted to an integrated blue rubber strap. The three-dimensional openworked dial showcases an inclined 24-second tourbillon positioned at 1 o'clock, alongside a power reserve indicator at 4 o'clock and a rotating three-dimensional globe displaying universal time from a North Pole perspective at 7 o'clock. A combined subsidiary dial between 10 and 11 o'clock indicates running seconds and a second time zone via a red hand. Driven by a manual-winding movement, the timepiece incorporates pronounced central arch bridges and an engraved titanium bezel with the brand's core philosophical tenets.

Front view of the Greubel Forsey GMT Sport Earth watch showing the openworked dial, globe, tourbillon, and integrated blue strap — Christie's. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: onlineonly.christies.com
Category: Wristwatch · Tourbillon world time wristwatch
Maker / attribution: Greubel Forsey
Reference: Not recorded
Catalogue / lot identifier: 18
Source-reported date: circa 2019
Country: Switzerland
Source-reported serial: 04 881

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 Exterior Architecture

The timepiece features a 45 mm titanium case designed in an ovoid form with integrated lugs, fitted with an integrated blue rubber strap secured by a titanium double deployant buckle. The crown features segmented blue rubber accents matching the blue rubber strap.

Engraved lettering visible around the bezel includes the terms 'BIENFACTURE', 'ARCHITECTURE', 'PERFECTION', 'TECHNICITE', 'HARMONIE', and 'SAVOIR-FAIRE'.

Evidence for this section

“The watch featured a new ovoid case with integrated lugs and a sporty rubber strap that fit any wrist.”
“BUCKLE: Titanium double deployant buckle”
“The crown features segmented blue rubber accents matching the blue rubber strap.”
“Text engraved along the bezel includes 'BIENFACTURE', 'ARCHITECTURE', 'PERFECTION', 'TECHNICITE', 'HARMONIE', and 'SAVOIR-FAIRE'.”

Dial Display and Movement Architecture

The openworked three-dimensional dial features skeletonized central hands with luminous triangular arrow tips extending over an arched bridge structure. A suspended arch center bridge supports the gear train driving the hours and minutes hands. At 1 o'clock, the inclined tourbillon completes a full rotation every 24 seconds, with a cage reported in the essay to consist of 88 components weighing 0.38 grams.

Universal time is tracked at 7 o'clock by a three-dimensional blue and silver-tone globe visible from above the North Pole, turning in real time and surrounded by a sapphire crystal ring with 24-hour day/night divisions. An auxiliary dial between 10 and 11 o'clock integrates running small seconds on a rotating disc with a second time zone hand, alongside a power reserve indicator at 4 o'clock.

Evidence for this section

“Skeletonized central hands with luminous triangular arrow tips extend over an arched bridge structure.”
“A suspended arch centre bridge holds the gear train that follows the curve of the bridge that drives the hours and minutes hand.”
“The trademark inclined tourbillon completes a rotation every 24 seconds and is placed at 1 o’ clock. The tourbillon cage alone has 88 components but weighs only 0.38 grams thanks to light alloy pillars and titanium bridges.”
“A prominent three-dimensional blue and silver-tone globe is set into an aperture on the dial's lower left.”
“It is surrounded by a sapphire crystal ring with 24-hour divisions; where the wearer can read local time for all longitudes, including the day / night indicator (light zone / dark zone).”
“An auxiliary dial between 10 and 11 o’clock combines the small seconds on a large rotating disc, and the second time zone display with a hand.”

Documentation and Source Limitations

The case back is described in the source essay as featuring a sapphire cities disc displaying UTC universal and summer time across 24 cities; however, the reverse of the case is not visible in the provided image and is not independently verified.

The source documents exhibit an internal discrepancy regarding the edition size: the auction listing states that the Certificate of Authenticity confirms a '1/1 status', while the cataloguer's essay describes the watch as a 'unique piece 1/11'.

Evidence for this section

“The caseback features a sapphire cities disc to give UTC Universal and Summer Time for 24 cities in major time zones.”
“WITH: Certificate of Authenticity confirming its 1/1 status”
“The present timepiece (with blue accents and strap) is a unique piece 1/11 as confirmed by the Certificate of Authenticity that accompanies it.”

Open research questions

Does the Certificate of Authenticity indicate a one-off unique piece ('1/1') or number 1 of an 11-piece edition ('1/11')?
What specific city names and markings are printed or engraved on the reverse sapphire cities disc of case number 04 881?
What specific caliber designation or reference number was assigned by Greubel Forsey to this model?

Source evidence

Recorded claims and source quotations for Greubel Forsey GMT Sport Earth ‘Blue’ titanium world time tourbillon wristwatch
Field	Source-reported value	Source quotation
Case Number	04 881	“CASE NUMBER: 04 881”
Case Material	Titanium	“CASE MATERIAL: Titanium”
Diameter	45 mm	“DIAMETER: 45 mm.”
Movement Type	Manual-winding, tourbillon	“MOVEMENT: Manual-winding, tourbillon”
Functions	Time, world time, day/night indicator, power reserve	“FUNCTIONS: Time, world time, day/night indicator, power reserve”
Strap Material	Integrated blue rubber strap	“STRAP MATERIAL: Integrated blue rubber strap”
Buckle Type	Titanium double deployant buckle	“BUCKLE: Titanium double deployant buckle”
Circa Date	2019	“CIRCA: 2019”
Accompanying Accessories	Certificate of Authenticity, handbook (instruction manual), gloves, loupe, additional red rubber strap, and presentation box	“WITH: Certificate of Authenticity confirming its 1/1 status, handbook (instruction manual), gloves, loupe, additional red rubber strap, and presentation box”

Visible details

Text engraved along the bezel includes 'BIENFACTURE', 'ARCHITECTURE', 'PERFECTION', 'TECHNICITE', 'HARMONIE', and 'SAVOIR-FAIRE'.
A prominent three-dimensional blue and silver-tone globe is set into an aperture on the dial's lower left.
The crown features segmented blue rubber accents matching the blue rubber strap.
Skeletonized central hands with luminous triangular arrow tips extend over an arched bridge structure.

Research qualifications

The case back and its described sapphire cities disc are not visible in the provided photograph.
The source text notes '1/1 status' in one section and '1/11' in the essay text, presenting an internal discrepancy regarding the edition size.

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

Consulted source

GREUBEL FORSEY, GMT SPORT EARTH ‘BLUE’, A RARE TITANIUM WORLD TIME TOURBILLON WRISTWATCH, CASE NUMBER: 04 881 | Christie’s

Reviewed 2026-10-21 · Record cfee34a016

Terms in this record

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