Ephraimiten were the inferior or fake coins in which part of the silver was replaced with copper. Ephraimits, inferior in fineness, dominated the economy of Duchy of Saxony and the Kingdom of Prussia from 1756 till 1763 during the Seven Years' War. They were spread by merchants and soldiers in Silesia, Bohemia, Poland and Courland and traded at the value of coins with the pre-war precious metal content. In return they would receive higher value foreign coins, which were used to pay the import of army supply. By the end of 1762 Fredrick the Great left his policy. After the war the Ephraimiten were withdrawn from circulation.