Greubel Forsey presents the latest chapter in its pursuit of horological perfection: a new interpretation of the GMT Balancier Convexe, now more refined, wearable, and technically accomplished than ever before. This is not merely a timepiece—it is a transformation.
Though it shares its name with an earlier model, this creation marks a profound evolution. The newly sculpted, more compact convex case ensures optimal comfort on the wrist, while a seamlessly integrated power reserve adds functional elegance. Every detail has been revisited with heightened precision, delivering unmatched technical and aesthetic harmony.
At its heart, the signature terrestrial globe remains—a breathtaking miniature Earth that rotates in real time over 24 hours, now showcased within an architectural amphitheatre that rises to meet the sapphire crystal. Encircling this kinetic sculpture are meticulously layered displays: local time, universal time, a second time zone, and an intuitive day/night indicator—all presented with Greubel Forsey’s uncompromising dedication to depth, dimension, and legibility.
The mechanical drama of the GMT Balancier Convexe continues with one of Greubel Forsey’s most iconic signatures: the 30˚ inclined balance wheel, suspended in space beneath a flawlessly black-polished steel bridge. This hypnotic regulating organ is flanked by a refined small seconds display, each element playing its part in a dial layout that is as precise as it is poetic.
Enhancing both performance and visual symmetry, a newly integrated 72-hour power reserve is seamlessly embedded into the composition—an innovation that adds utility without disturbing the harmonious equilibrium of the dial.
Encasing this intricate choreography is Greubel Forsey’s unmistakable Convexe case, crafted from lightweight titanium and newly refined in form. With a diameter of 42.9 mm at the caseband, it delivers superior ergonomics while preserving the bold architectural language collectors have come to revere.
The domed sapphire crystal, three-dimensional bezel, and integrated lugs speak to a sculptural sensibility—each curve and angle meticulously considered. Offered on a matching titanium bracelet or a hand-sewn rubber strap, the watch transcends utility to become wearable art. For the connoisseur, it is not simply a timepiece—it is a declaration of mechanical mastery.
Technical Specifications:
GMT Balancier Convexe
In titanium
Limited edition
Patented hand-wound movement
GMT • 2nd time zone • rotating globe with universal time and day-and-night • universal time on 24 time zones • summer and winter time • cities observing summer time • GMT pusher • 30° inclined Greubel Forsey balance wheel system • hours and minutes • small seconds • power-reserve
MOVEMENT
MOVEMENT DIMENSIONS
• Overall diameter: 37.80mm
• Thickness: 13.80mm
NUMBER OF PARTS
• Movement: 496 parts
• Escapement platform: 59 parts
NUMBER OF JEWELS
• 72
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE
• 72 hours
BARRELS
• Two series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
BALANCE WHEEL
• In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
FREQUENCY
• 21’600 vibrations/hour
BALANCE SPRING
• Phillips terminal curve
• Geneva-style stud
BRIDGES AND MAIN PLATES
• Titanium and nickel-silver
• Frosted, polished bevelling and countersinks, straight-grained flanks
ESCAPEMENT PLATFORM
• Inclined at a 30° angle
• Flat black polished steel, polished bevelling and countersinks, straight-grained flanks
• Polished steel pillars
• Flat black polished and barrel polished steel balance wheel bridge
GEARING
• Involute circle profile
• Inclined gear with profiled teeth on fourth wheel
DISPLAYS
• Hours and minutes
• Small seconds
• 2nd time zone GMT
• Rotating globe with universal time
• Day-and-night
• 24 time zones universal time
• Summer time, winter time
• 72-hours power reserve on a sector
EXTERIOR
CASE
• Titanium with curved sapphire crystal
• Three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining
• Profiled lugs, screwed fixing
• Transparent back with curved and high domed synthetic sapphire crystal
• Engraved GMT pusher
• Titanium security screws
• Raised engraving “GMT” and “Greubel Forsey”
CASE DIMENSIONS
• Caseband diameter: 42.90mm
• Bezel diameter: 44.90mm
• Case height: 15.10mm
• Height on synthetic sapphire crystals: 17.60mm
WATER RESISTANCE OF THE CASE
• Water-resistant 5atm – 50m – 164ft (standard NIHS 92-20/SN ISO 22810:2010)
CROWN
• Titanium, polished, frosted and straight-grained, with GF logo
DIAL SIDE
• Terrestrial globe in titanium, relief-engraved continents, ocean blue treatment
• Day-and-night UTC indicator in titanium, engraved and lacquered
• GMT indicator in gold
• Amphitheatre hour-ring with engraved and lacquered minute-circle
• Small seconds indicator in gold
MOVEMENT SIDE
• Synthetic sapphire disc displaying city names surrounded by 2 rings (UTC and summer time) engraved and lacquered, hand matt lapped
• Gold “summer time” plate with limitation number, raised engraving, hand matt lapped
HANDS
• Hours and minutes, red triangles with Super-LumiNova • 2nd time zone GMT indicator, red triangle
• Small seconds in polished blued steel, flat black polished head
STRAP AND CLASP
• Hand-sewn textured rubber or rubber with text in relief
• Titanium folding clasp, engraved GF logo
• On demand: 3-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo
This new GMT Balancier Convexe will be made in a strictly limited series of 22 timepieces. Price upon request
For more information please visit Greubel Forsey