Assertion: english silver crown | /r/HasProperty | one of many silver coins
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text: The coin's origins lay in the English silver crown, one of many silver coins that appeared in various countries from the 16th century onwards, the most famous example perhaps being the famous Spanish pieces of eight, all of which were of a similar size and weight (approx 38mm diameter and containing approx 25 grams of fine silver) and thus interchangeable in international trade.