At SIHH 2015, Cartier’s headliner launch was the Clé de Cartier collection, an entirely new family of timepieces whose case design incorporated a key-operated winding crown (Clé is French for “key”). Today at SIHH 2016, Cartier unveiled the first skeletonized watch in that collection, which also features Cartier’s first-ever skeletonized automatic movement made in-house.…