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
European Exchange Rate Mechanism letter to the Eurogroup in July 2018 on its desire to participate in ERM II. In theory, most of the currencies are allowed to fluctuate as much as 15% from their assigned value. In practice, however, the currency of Denmark deviates very little. The former members of ERM II are the Greek drachma, Slovenian tolar, Cypriot pound, Estonian kroon, Maltese lira, Slovak koruna, Lithuanian litas and Latvian lats. European Exchange Rate Mechanism The European Exchange Rate Mechanism (ERM) was a system introduced by the European Economic Community on 13 March 1979, as part of the European Monetary System (EMS), to