Ballon Bleu de Cartier 40The Ballon Bleu de Cartier watch boasts a 40 mm mechanical movement with automatic winding courtesy of the 1847 MC. The ste el case is paired with a fluted steel crown featuring a synthetic cabochon shaped spinel. A sunray brushed dark green dial is adorne d with silvered sword shaped hands, all protected by a sapphire crystal. The accompanying interchangeable steel bracelet adds versat ility, while a calendar aperture at 3 o'clock and water