Estonian kroon until the Soviet invasion in 1940 and Estonia's subsequent incorporation into the Soviet Union when it was replaced by the Soviet ruble. After Estonia regained its independence, the kroon was reintroduced in 1992. The kroon became the currency of Estonia on 1 September 1928 after having been a unit of account since 1924. It replaced the mark at a rate of 100 mark = 1 kroon. The kroon was subdivided into 100 sent. In 1924, the kroon was pegged to the Swedish krona at par, with a gold standard of 2480 kroon = 1 kilogram of pure gold. The standard
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