93.3 (3 oz). This 3 Oz Silver coin is the new release in the “Archeology & Symbolism” series. In this edition: Antikythera Mechanism. The coin features Smartminting technology, has Antique Finish quality, and comes in a beautiful case, along with the Certificate of Authenticity. Limited mintage of only 333 pcs worldwide! The reverse of the coin depicts Antikythera mechanism, generally known as the first analogue computer and discovered in 1902 in a Roman shipwreck of the coast of Antikythera, Greece. The obverse of the coin features the effigy of Her Majesty Queen Elizabeth II with the inscriptions: “ELIZABETH II”- the name of the Queen, “COOK ISLANDS”- the country of issue, “ARCHEOLOGY & SYMBOLISM”- the name of the series and”20 DOLLARS”- the face value.