For Geneva Watch Days 2021, Greubel Forsey unveils the third and final interpretation of its GMT Earth. Fully dressed in black, and featuring a new titanium case, it’s the most mysterious, intense, and modern of the GMT Earth timepieces. It is a limited edition of 11 pieces.
With the GMT Earth, Greubel Forsey introduced a watch that, for the first time, makes it possible to appreciate the entirety of the world. The design of the Earth is visible from all angles in the timepiece’s new sapphire alcove. On the front as well as the back, the laser-engraved Earth shows world times that are easy to read.
After the initial white gold and the second edition in platinum, Greubel Forsey’s third variant of the GMT Earth comes with a new titanium case. Almost twice as light as steel, it resists temperature variations, and is non-magnetic, hypo-allergenic, and eight times stronger than gold or platinum. Weighing only 117g, the weight of the strap has been reduced by two-thirds. The case shed just over a third of its weight. Titanium is used for the entire case, the bridges, the GMT push-piece, the crown and the folding buckle, the latter two being the components most exposed to shocks and scratches.
A black finish on the dial is featured on an all-black natural rubber strap, whose inner face is engraved with the values of the Greubel Forsey Atelier and which are visible on the bezel.
The GMT Earth displays four important pieces of information on its dial side. The first is the off-center hours, minutes and seconds display. The first two feature large open-worked hands finished with a Super-LumiNova tip, complemented by a small seconds hand on a sapphire disc at three o’clock. Positioned on the left, the GMT indicator’s red hand can be easily seen on 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.
Between 7 o’clock and 9 o’clock, the Earth takes 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 the wearer to see which hemisphere is in the daytime and which is at night.
Placed on the side of the caseband, a final window opens to show the equator. This allows the Earth to be seen from all angles. Finally, on the caseback side, the worldtime display indicator completes the design. 24 time zones indicate the UTC of 24 major cities – with those that observe daylight savings on a white background.
The GMT Earth is equipped with the Tourbillon 24 Secondes that utilizes a fast rotation speed and is set at an angle to resolve the positioning problem in relation to gravity. The 25° angle and the rapid rotation of the tourbillon cage improve the chronometric performance of a system that contains only one tourbillon.