Pre-SIHH 2015, Greubel Forsey is pleased to announce the launch of the GMT Black exploring a new design with a titanium case and treated with vacuum deposited ADLC. This is a unique edition of 22 pieces worldwide. The timepiece features a case measuring 43.5 mm in diameter housing a GF05 in-house movement with 24 second tourbillon inclined at a 25 degree angle, GMT function, three-dimensional globe for day/night indication, rotating disc with 24 different time zones, daylight savings indication, and 72 hour power reserve. This watch is the exact same watch as its predecessors in platinum, rose gold or white gold GMTs reviewed here but with a DLC Titanium case. The 25° inclined Tourbillon '24 Secondes' cage at 5 o'clock is one of Greubel Forsey’s major patented inventions. The single inclined tourbillon cage undergoes rapidly changing positions with a high angular velocity, thus minimizing the effects of gravity on the regulating organ and maximizing timekeeping accuracy.