Ballon Bleu de Cartier watch, 40 mm, mechanical movement with automatic winding, calibre 1847 MC. Steel case, fluted crown set with a synthetic cabochon-shaped spinel, silvered guillochŽ dial, blued-steel sword-shaped hands, sapphire crystal, interchangeable bracelet in grained black leather skin, steel interchangeable folding buckle, calendar aperture at 3 o'clock.