Estonian kroon 4 days after the founding of the Estonian SSR, the last Estonian pre-WW II coin, the new 1 sent (date 1939), was issued. In 1927, before the kroon was officially introduced, 100 marka banknotes circulated with an "ÜKS KROON" (1 kroon) overprint. Eesti Pank introduced 10 krooni notes in 1928, followed by 5 and 50 krooni in 1929, 20 krooni in 1932 and 100 krooni in 1935. The kroon was reintroduced as Estonia's currency on 20 June 1992, replacing the Soviet ruble at a rate of 1 kroon = 10 rubles. (Each person was able to change a maximum of
History of the euro and devaluations set back aspirations for European monetary union. However, in March 1979 the European Monetary System (EMS) was created, fixing exchange rates onto the European Currency Unit (ECU), an accounting currency, to stabilise exchange rates and counter inflation. It also created the European Monetary Cooperation Fund (EMCF). In February 1986 the Single European Act formalised political co-operation within the Community including competency in monetary policy. European Council summit in Hannover on 14 June 1988 began to outline monetary co-operation. France, Italy and European Commission backed a fully monetary union with a central bank, which British Prime Minister Margaret Thatcher