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
Estonian kroon until 15 January 2011 at which point it ceased to be legal tender. However, the Eesti Pank will indefinitely exchange kroon banknotes and coins in any amount into euro. In 1992, banknotes were introduced in denominations of 1, 2, 5, 10, 25, 100 and 500 krooni. Some of the 5, 10, 25, 100 and 500 krooni notes were dated 1991. In 1994, a 50 krooni note was introduced. Unlike others, the 1 kroon and 50 krooni notes were issued only once. Notes in circulation before being replaced by the euro: In 1992, coins were introduced (some dated 1991) in denominations