This is a Greek commemorative silver coin. Coin Name: 30 Greek Drachmas (30 Drachmai - 30 Δρ). Occasion for Issue: The centenary of the founding of the Greek Royal Family (House of Glücksburg). Year of Issue: 1963 (and bears the dates 1863 - 1963 on the reverse). Metal: Silver with a purity of 83.5% (Silver 0.835). Weight: 18 grams. Design Details: Obverse: Map of Greece and its islands, showing the nominal value of 30 ΔΡ. Reverse: The royal crown and the Greek cross surrounded by 5 profiles of the five Greek kings of the dynasty (George I, Constantine I, Alexander I, George II, and Paul I).