Ballon Bleu de Cartier watch, 42 mm. Mechanical movement with automatic winding, caliber 1847 MC. Steel case, fluted 18K yellow gold (750/1000) crown set with a synthetic cabochon-shaped spinel. Silvered guilloché dial. Blued-steel sword-shaped hands. Sapphire crystal. Calendar aperture at 3 o’clock. Interchangeable two-tone strap. Thickness: 13 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).