This watch is also known as:
Piaget Altiplano Double Jeu Watches. Large size, two 18K white gold cases superimposed upon each other. The top case is set with diamonds and has a silver dial with Piaget 838P manual wind movement with small second hand and sapphire caseback. It hinges open to reveal another case with separate black dial, Piaget 830P manual wind movement, and engraved caseback on black leather strap.