Cartier's Ballon Blue collection made its debut in 2007 with a unique, round case that resembles a smooth pebble. A notable feature is the recessed and protected crown that creates a subtle "dent" in the dial. The W69005Z2 model boasts a luxurious yellow gold case and a sleek silver dial. Its self-winding caliber 049 movement ensures precise timekeeping, and it comes with a matching yellow gold bracelet.