Complete set, Cartier, Blue Balloon collection, model: W4BB0016. The spherical crown at 3 o'clock is the soul design of this series. It is embedded with a convex-shaped synthetic corundum stone. The round egg-shaped case is different from traditional round wristwatches. It fits the wrist gently and smoothly. The silver-white radiating pattern dial is centered with a sunburst interlaced engraving. Black Roman numeral markings, blue steel hardened hour hands.