Ballon Bleu de Cartier watch, 37 mm, mechanical movement with automatic winding, moon phases. Case in steel. Silvered flinqué dial, Roman numerals, moon phases at 9 o'clock, blued-steel sword-shaped hands. Sapphire crystal. Steel bracelet, 180 mm wrist circumference. Case thickness: 13 mm. Water-resistant to 3 bar (approx. 30 meters).