Large Portique Mystery Clock Cartier Paris, 1923 Platinum, gold Rock crystal dial, columns and Biliken figure Rose-cut diamonds Coral cabochons, onyx Black enamel Square, 8-day double-barrel movement, gold-plated, 13 jewels, bimetallic balance, Breguet balance spring. Transmission axle in rock-crystal crossbar masked by coral cabochon. Billiken figure removable to provide access to the movement. Arbor for winding movement and setting hands.