Greubel Forsey keeps moving forward with the Atelier unveiling the third terrestrial interpretation of its GMT Earth. This unique and now even more modern creation features a new titanium case and is adorned with an even more elegant intense black finish: limited edition of 11 pieces.
With the GMT Earth, Greubel Forsey has created a watch that, for the first time, makes it possible to appreciate the entirety of the world in a single glance – this technical feat first appeared in 2011. At the time of the first ‘GMT’, the Earth was not yet fully revealed. Seven years later, the design of the Earth was finally complete: visible from all angles in its new sapphire alcove, it appears as though it is floating in space.
The first version of the GMT Earth was in white gold. The second, in platinum. Today, this timepiece is available with a new titanium case.
The GMT Earth in titanium will be available in a limited edition of 11 pieces, three times less than the original version. Weighing just 117 g, the weight of the strap has been reduced by two-thirds. The case has lost just over a third of its weight. Titanium is used not only for the entire case, but also the bridges, the GMT push-piece, the crown and the folding buckle, the latter two being the components most exposed to shocks and scratches. To accompany the light and matt tones of titanium, Greubel Forsey opted for a black finish on the dial.
The GMT Earth displays four key pieces of information on its dial side. The first is the off-centre hours, minutes and seconds display. The first two feature large openworked hands finished with a Super-LumiNova tip, complemented by a small seconds hand on a sapphire disc at three o’clock.
On the left is the GMT indicator, whose red hand effortlessly stands out against a hand-engraved black gold disc filled with lacquer. The third, located opposite the crown, is the power reserve, designed following the same process: a black, engraved gold segment, filled with lacquer and covered by a silver-polished steel hand.
Finally between 7 o’clock and 9 o’clock, the Earth occupies the largest space, completing a full rotation in 24 hours. The engraved sapphire ring around the equator acts as a day / night indication and allows you to instantly see which hemisphere is in the daytime and which is at night.
The GMT Earth boasts Greubel Forsey’s third invention. The Tourbillon 24 Secondes uses a fast rotation speed and is set at an angle to resolve the positioning problem in relation to gravity and which is crucial for the operation of the oscillator.
Technical Specifications:
GMT Earth
Limited edition of 11 pieces in titanium
Hand-wound movement with 3 patents
GMT • 2nd time zone • rotating globe with universal time and day-and-night • complete and global view from northern to southern hemisphere • universal time on 24 time zones • summer and winter time • cities observing summer time • lateral window showing the equator • GMT pusher • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve
Movement:
Movement dimensions
• Diameter: 36.40mm
• Thickness: 11.55mm
Number of parts
• Movement: 453 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.39g
Number of jewels
• 60
• Olived-domed jewels in gold chatons
Chronometric power reserve
• 72 hours
Barrels
• Two coaxial 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
• Variable-inertia with gold mean-time screws
(10mm diameter)
Frequency
• 21’600 vibrations/hour
Balance spring
• Phillips terminal curve
• Geneva-style stud
Main plate
• Nickel silver, frosted and spotted with polished
bevelling and countersinks, straight-grained flanks, black treatment
Bridges
• Nickel silver, frosted with polished bevelling
and countersinks, straight-grained flanks,
black treatment
• Flat black polished steel tourbillon bridge, hand-polished bevelling and countersinks
• Flat black polished steel screws, blued by
heat treatment
Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight
Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel
and profiled teeth on escape wheel pinion
Displays
• Hours and minutes
• Small seconds
• 72-hours power reserve on a sector
• 2nd time zone GMT
• 24 time zones universal time
• Rotating titanium globe with universal time
• Complete view from North Pole to South Pole
• Summer time
• Day-and-night
Exterior:
Case
• In titanium, with titanium plates, engraved,
hand-finished with text, screwed to the caseband
• Lateral window with shaped synthetic
sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Three-dimensional synthetic sapphire crystal caseback, with integrated dome
• Three-dimensional, asymmetrical, synthetic
sapphire crystal bezel
• Raised polished engraving “GMT Earth” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Titanium GMT pusher with raised engraving
on a hand-punched background
• Engraved individual number
Case dimensions
• Diameter: 45.50mm
• Height: case 16.18mm
(height on synthetic sapphire dome 18.00mm)
Water resistance of the case
• Water-resistant 3atm – 30m – 100ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown
• In titanium, synthetic sapphire insert with GF logo
Dial Side
• Multi-level hour-ring in synthetic sapphire,
galvanic growth hour indexes, engraved
and lacquered minutes and small seconds
• Power-reserve and GMT indicators in gold,
engraved and lacquered, circular-grained,
black treatment
• Rotating globe with day-and-night UTC indicator
in synthetic sapphire, engraved and lacquered
Movement Side
• Synthetic sapphire disc displaying city names
surrounded by 2 gold rings (UTC and summer time) engraved and lacquered
• Gold “summer time” plate with individual
number, raised engraving
• South Pole of the globe with UTC indicator,
engraved and lacquered, hand matt lapped
Hands
• Hours, minutes, small seconds and power-reserve in polished steel, hand-polished countersinks
• 2nd time zone GMT indicator, red triangle
Strap and clasp
• Rubber or hand-sewn alligator
• Titanium folding clasp, engraved with the GF logo
For more information please visit https://www.greubelforsey.com