The term 'OLD COIN WORTH FIVE FRANCS' can be summarized as an ECU, which is a three-letter acronym for the European Currency Unit. The ECU was a unit of account used by the European Union from 1979 to 1998 and was based on a basket of the currencies of the EU's member states. It was replaced by the euro in 1999. The ECU was also used as a currency in its own right, with coins and banknotes issued in denominations of five francs.