In the past half-century, since it launched its GMT-Master, Rolex has brought out just two new complications: the Rolex Replica Yacht-Master II, in 2007, with a countdown yacht timer, and the Rolex Sky-Dweller, equipped with both a second time zone and an annual calendar, in 2012. In this feature from our Baselworld 2012 issue, we explain how the Sky-Dweller, and its innovative movement, work. The Rolex Sky-Dweller contains a new caliber, 9001, which Rolex makes in house. The second time…