GMT Quadruple Tourbillon is a luxury wristwatch from Greubel Forsey.

New edition of the previous model in white gold, this time (February 2021) in titanium case and with sporty design. Although products of the highest rank are to be expected from the brand anyway, this model also represents a top performance within the in-house range.

The Quadruple Tourbillon is Greubel Forsey’s second Fundamental Invention, The mission: to average out positional errors due to gravity in all situations, especially in stable wristwatch positions. To achieve this, the original tourbillon has been elevated to realise its full potential: inclined at 30°, doubled and then quadrupled. The result, two synchronised Double Tourbillon 30° mechanisms, where a first cage, inclined at 30° and rotating in one minute, is nested within a second horizontal cage, completing a full rotation in four minutes. A spherical differential transmits the average timing rate of the four tourbillon cages, improving the overall chronometric performance of all the regulating organs.

Planet Earth, set near eight o’clock, shines in a new light with the blue livery. An original Greubel Forsey creation from ten years ago (2011), the rotating terrestrial globe allows for the simultaneous display of several different time zones: on the dial side, with a 24-hour ring around the Earth, for Day/Night indication and on the caseback side, displaying 24 major cities their respective time zones while distinguishing between those which use summer time (on a light coloured backdrop), and those which do not (on a dark backdrop).

The sapphire crystal window around the equator completes the timepiece, offering a complete view of the Earth in motion, with its continents immersed in the deep blue ocean waters, complementing the exquisite blue finish of the power reserve, hour circle and strap.

• Greubel Forsey GMT Quadruple Tourbillon, YouTube, 0:59