Greubel Forsey GMT Black: Different color, same mechanised marvel.       Set to presentación at the upcoming 2015 SIHH, the Greubel Forsey GMT Black is a new edition of the world time watch the company on sale since 2011.   This features the same asymmetrically formed case (43. 5mm by 16. 14mm) as the initial, but now in black ti and treated with...