Ballon Bleu de Cartier watch, 37 mm. Self-winding mechanical movement, moon phases. Stainless steel case, fluted crown set with a synthetic cabochon spinel. Guilloche silver dial. Moon phases at 9 o'clock. Blue steel sword-shaped hands. Sapphire crystal. Second strap in blue alligator skin, interchangeable steel folding buckle. Case thickness 13 mm. Waterproof up to 30 meters.