Ballon Bleu de Cartier watch, 40 mm, mechanical movement with automatic winding, caliber 1847 MC. 18K yellow gold (750/1000) case, fluted 18K yellow gold (750/1000) crown set with a sapphire cabochon, blue sunray dial, golden-finish steel sword-shaped hands. Sapphire crystal. Interchangeable dark blue alligator leather strap, 18K yellow gold (750/1000) interchangeable folding clasp, calendar aperture at 3 o'clock. Thickness: 12.4 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).