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The écu was a gold and silver coinage system introduced in France in 1266 by Louis IX, so called because the coins featured the French coat of arms. The silver coin proved popular but the gold did not, because of the unrealistic ratio of 1:10 used, which did not properly reflect the metals' exchange rate. The écu remained in use for 500 years. Depicted here are two écu coins, the first made of gold and minted in 1641, in the reign of Louis XIII, and the second made of silver and minted in 1784, in the reign of Louis XVI. Between these two dates, exchange rates were unstable, new coins were issued, and existing ones revalued periodically.Coin design credit: Kingdom of France; photographed by the National Numismatic Collection
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