Cartier Ballon Bleu de Cartier

Cartier's Ballon Bleu de Cartier, reference W4BB0021, has a 33 mm round case in steel. The case measures 10.49 mm in thickness. The movement is self-winding and mechanical, with a 47 hour power reserve. A sapphire crystal covers the dial. The silvered guilloché dial is set with 11 brilliant-cut diamonds totalling 0.05 carat, and the hands are blued steel and sword-shaped. The fluted crown is set with a synthetic cabochon-shaped spinel. Cartier rates the case to 3 bar, approximately 30 metres. The Ballon Bleu is fitted with an interchangeable steel bracelet.