The globe protrudes from a large aperture at 8 o’clock, and the tourbillon cage is located at 5 o’clock. The main time and power-reserve indicators are arranged in a “cascading” arrangement on the upper right side of the dial. The large hours-and-minutes subdial is at 1 o’clock; overlapping it are the small seconds subdial at 2 o’clock and a semicircular power-reserve display at 3 o’clock. The subdial indicating the second time zone is at 10 o’clock. On the back of the watch, a rotating disk with the names of 24 world cities displays universal time for all 24 time zones, with the lighter-colored cartouches indicating summer or daylight savings times for the zones that use them.
The movement in the Greubel Forsey GMT is made up of 443 parts (87 parts for the tourbillon alone) and has two barrels providing a 72-hour power reserve. It features a range of hand finishes, including polishing, lapping, straight-graining and flat black polishing. The case is “medium-sized,” by Greubel Forsey standards — 43.5 mm in diameter and 16.14 mm thick — because the watchmakers were able to keep the diameter of this very complicated movement to a relatively small 36.4 mm. The watch comes on a black alligator strap with a platinum folding clasp.