Some watch brands dazzle with diamonds, while others impress aficionados with complicated movements. Greubel Forsey, famed for its intricate mechanisms, belongs to the latter category.

The brand has managed to surprise the industry with its increasingly complicated timepieces, year after year. SIHH 2012 was no exception with the launch of the new GMT, which marks the first time the brand has combined the tourbillon with GMT functions.

"When the product team first started to design the GMT, they had in mind how to make it different from other GMT watches," says David Bernard, chief operating officer of Greubel Forsey.

"We wanted to make a watch that displays a three-dimensional globe at the front and a 24-time-zone disc at the back. We wanted to make a watch which is very complicated but, at the same time, user-friendly."

Featuring a second time zone in the form of a rotating globe displaying time around the world, the GMT is geared towards those who frequently travel for business or pleasure.

A blackened half of the ring around the globe indicates the night-time hemisphere from 6pm to 6am, while a whitened part of the globe shows the day-time hemisphere. The whitened portion features a lateral window incorporated into the case band, letting in light to represent daytime.

The back of the GMT is adorned with a world-time disc showing the names of 24 cities, including New York, Moscow, Bangkok and Sydney, each representing one of the global time zones. Housed in a 43.5mm-diameter white gold case, the timepiece has 72 hours of power reserve and comes with a hand-sewn black alligator leather strap with a Greubel Forsey folding clasp in white gold.