Ballon Bleu de Cartier watch, 42 mm, mechanical movement with automatic winding. Case in steel, fluted crown set with a synthetic cabochon-shaped spinel. Silvered guilloché opaline dial. Blued-steel sword-shaped hands. Sapphire crystal. Black alligator-skin strap, interchangeable steel folding buckle. Case thickness: 12.1 mm. Water-resistant to 3 bar (approx. 30 metres).