Ballon Bleu de Cartier watch, 42 mm, mechanical self-winding movement. Steel case, fluted crown decorated with a synthetic spinel cabochon, silvered guilloché dial, Roman numerals, blued-steel sword-shaped hands, sapphire crystal, alligator-skin strap with double adjustable folding steel buckle, calendar aperture at 3 o'clock. Case dimensions: diameter: 42.1 mm, thickness: 13 mm. Water-resistant to 3 bar (approx. 30 metres).