The doubloon was a Spanish gold coin worth two escudos or 32 reales weighing 6.867 grams (0.221 troy ounces), introduced in 1537. It became the model for several other gold coins issued in Europe, including this 1626 two-doppie gold coin issued in Piacenza in northern Italy by the Duchy of Parma, depicting Odoardo Farnese, Duke of Parma, on the obverse. The coin is part of the National Numismatic Collection at the National Museum of American History.Coin design credit: Duchy of Parma
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