This article originally appeared on GOBankingRates.com: These 13 French Coins Are Worth Thousands, Including One up to $456K If you travel to France these days, you’ll be dealing in European currency ...

Under that law, the franc coin would contain 4.5 grams of silver and 0.5 of alloy metal, for a total weight of five grams. The first 1-franc coin was minted in 1795.