Ballon Bleu de Cartier watch, ultra-thin, 40 mm. Manufacture mechanical movement with manual winding, caliber 430 MC. Case in rose gold 750/1000, fluted crown set with a sapphire cabochon, silvered opaline dial, Roman numerals, sword-shaped hands in blued steel, sapphire crystal, strap in brown alligator skin, ardillon buckle in rose gold 750/1000. Diameter: 40 mm. Thickness: 6.9 mm. Water-resistant to 30 meters.