Water- resistant to 100 meters, the new GMT Sport stands out as their most sport oriented timepiece to date. The movement was constructed from scratch – from the suspended arched bridge for the hours and minutes display, to the unique showcase of the Tourbillon 24 Secondes and the universal time display with three dimensional globe. Another truly assertive Greubel Forsey – and a revolution: the successful alliance between ergonomics, technicity and architecture.
 

The display side of the GMT Sport presents classic Greubel Forsey architecture, an open, orchestrated theatre between suspended bridges, semi-apparent wheels and floating dials in three dimensions. In keeping with the sporting vocation of this timepiece, the focus is on legibility and efficiency. The hours and minutes are displayed by concentric openworked hands whose curved profile follows the curvature of the case and movement. Mounted on the suspended arch centre bridge with black treated openings, the gear train literally follows the curve of the bridge, overlooking the globe to drive the hour and minute hands. Ensuring excellent visibility in the dark, the triangular tips of the arrow-shaped hands and the markers on the minute-hour-ring are enhanced with luminescent coating. 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. These two coaxial displays with red triangular indexes underline this timepiece’s technicity. The 72-hour chronometric power reserve (ensured by two coaxial barrels in series) is indicated on a sector at 3 o’clock with its openworked hand and highlighted red triangle. Housed underneath the arched bridge, the power reserve differential is subtly engraved with Greubel Forsey’s values. Whether they are visible on the dial side or concealed in the caseback side, each of the 435 components of this hand-wound movement, including titanium plates and bridges, respect the most demanding criteria of the Greubel Forsey Atelier and the teams utmost concern for the finest workmanship.
 

Precision and reliability summarise Greubel Forsey’s ground-breaking GMT mechanism, presented for the first time in 2011, with the GMT Black presented in 2015. In this double-patented mechanism, the second time zone indication on the auxiliary dial between 10 and 11 o’clock is combined with a universal time display to intuitively read the current time anywhere in the world. The remarkable innovation and striking spectacle of the terrestrial rotating globe – seen from above the North Pole – performs each complete anticlockwise turn on its axis in 24 hours. It’s 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). On the caseback side of the GMT Sport, outer and central rings complete the sapphire cities disc to give UTC Universal and Summer Time for 24 cities in major time zones. This disc distinguishes those time zones applying summer time (on a light background) from those that do not (on a dark background). Reviewing the ergonomics, the GMT’s functions use two pushers located on the left side of the case; one to select the second time zone and the other for synchronising the local time with the globe. The titanium and rubber crown also ensures optimum setting.