Pulled up from the bottom of the ocean in 1901, the Antikythera Mechanism is thought to be one of the earliest versions of an analog computer! And its early – the machine has been dated back to at least 87BC! Possibly used to predict astronomical events, such as eclipses, the ancient mechanism is the subject of this super collectable. An absolutely spectacular coin, each huge 65mm, three ounce, 99.9% pure silver Antikythera Mechanism collector issue bars a high relief design, packed with detail. Limited mintage of just 333. Minimum Gross Weight (g).