Cartier Ballon Bleu de Cartier

Cartier makes the Ballon Bleu de Cartier WSBB0071 with a 40 mm steel case. The round case is 12.4 mm thick. The movement is the self-winding calibre 1847 MC, which has a 40 hour power reserve. A sapphire crystal covers the brushed dark green sunray dial, and the hands are silvered and sword-shaped. The watch has central seconds and a date, with a calendar aperture at 3 o'clock. The fluted steel crown is set with a synthetic cabochon-shaped spinel. An interchangeable steel bracelet is fitted to the watch. Cartier rates the case to 30 metres.