Ballon Bleu de Cartier watch, 42 mm. Mechanical movement with automatic winding, caliber 1847 MC. Steel case, fluted crown set with a cabochon synthetic spinel, silver guilloché opaline dial. Blued-steel sword-shaped hands, sapphire crystal, black alligator leather strap, steel interchangeable deployant buckle. Calendar aperture at 3 o’clock. Thickness: 13 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).