Two months ahead of the SIHH 2018 —Salon International de la Haute Horlogerie—, Cartier presents the new Rotonde de Cartier Mysterious Day & Night Watch. The Rotonde de Cartier watch lends its generous dial to two historic Cartier complications: the mysterious movement and a Day/Night indicator. These two complications are part of Cartier’s watchmaking heritage both dating from 1912. On one hand, the mysterious movement was created for the Model A mystery clock, while the day/night movement was part of the Comet clock a.k.a the Planet clock.