Currency includes paper, cotton, or polymer banknotes and metal coins. Exchanging involves the use of money, comprising banknotes and coins. See Coins of the pound sterling and List of British coins and banknotes for details. Both banknotes and coins are subject to inflation. Colloquial Chilean Spanish has informal names for some banknotes and coins. Manchukuo had its own issued banknotes and postage stamps. Over one billion pounds in counterfeit banknotes were recovered. Current currencies whose all recent banknotes use the constellation are in bold. Forgery of forint banknotes is not significant. The Principality introduced a set of low denomination banknotes in 1974. There has been no significant change in the number of counterfeit banknotes detected. These banknotes are legal tender in Gibraltar alongside Bank of England banknotes. The bridge was depicted on the reverse of the Turkish 1000 lira banknotes of 1978-1986. This is in addition to the differences in sizes between the banknotes of various denominations. The Bank has a monopoly on the issue of banknotes in England and Wales.