GREECE – IMPERIAL ART SERIES – 2018 2 oz Pure Silver Coin with Mineral Insert – Niue. Greece is the fourth civilization presented on a coin of a series. This series is about. Architecture and the achievements of the greatest civilizations and empires. Mintage is only 500 pcs. Each coin is numbered on the edge and is located in a wooden box with dust jacket. Mintage is only 500 pieces. Fourth coin of the series. Features: Ultra High Relief Mintage: 500 Material: Pure Silver (99.99%) Finish: Antique Finish Issuer: Niue Island Weight: 2 oz Diameter: 50 mm Face Value.