Ballon Bleu de Cartier watch. 37 mm. Mechanical movement with automatic winding. moon phases. Case in steel. fluted crown set with a synthetic cabochon-shaped spinel. Silvered guilloché dial. Moon phases at 9 o’clock. Blued-steel sword-shaped hands. Sapphire crystal. Blue alligator-skin strap. interchangeable steel folding buckle. Case thickness: 13 mm. Water-resistant to 3 bar (approx. 30 metres).