(The only one in the world), Earl Full Gold Coin "Hidden Universe" Collection! Gold coins possess three kinds of value: historical value, economic value and artistic value. Piaget Master of Art, Gold Coin Watch (This watch is extremely difficult to make and can be described as a masterpiece of craftsmanship. The watchmaker has split an antique gold coin in the middle, revealing Piaget's own ultra-thin mechanical movement. The front of the gold coin can be controlled to open and close by a button.) The watch measures 30MM and is an unparalleled collectible.