Ballon Bleu de Cartier watch, 40 mm, Manufacture mechanical movement with automatic winding, caliber 1847 MC. Steel case, fluted crown set with a synthetic cabochon-shaped spinel, silvered guilloché dial, blued-steel sword-shaped hands, sapphire crystal, steel interchangeable bracelet, calendar aperture at 3 o'clock. Thickness: 12.4 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).