Ballon Bleu de Cartier watch, 42 mm. Self-winding mechanical movement, calibre 1847 MC. Steel case, 18-carat (750/1000) yellow gold fluted crown set with a cabochon-shaped synthetic spinel. Silver-coloured guilloché dial. Sword-shaped hands in blued steel. Sapphire crystal. Calendar aperture at 3 o’clock. Two-tone interchangeable strap. Thickness: 13 mm. Water-resistant to 3 bar (approx. 30 metres/100 feet).