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Until the early 19th century, Guernsey used predominantly French currency. Coins of the French livre were legal tender until 1834, with French francs used until 1921. In 1830, Guernsey began production of copper coins denominated in doubles. The double was worth 1/80 of a French franc. The name "double" derived from the French "double deniers", although the value of the coin was equal to the liard (3 deniers piece) still circulating. Coins were issued in denominations of 1, 2, 4 and 8 doubles. The 8 double coin was a "Guernsey penny", with twelve to the "Guernsey shilling" (worth 1.2 francs). However, this shilling was not equal to the British shilling (worth 1.26 francs, as the exchange rate according to the respective gold standards was 25.22 francs = 1 pound sterling).