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
European Monetary System makers at least since the Second World War. Two primary factors account for this: The European Monetary System was no longer a functional arrangement in May 1998 as the member countries fixed their mutual exchange rates when participating in the euro. Its successor however, the ERM-II, was launched on 1 January 1999. In ERM-II the ECU basket was discarded and the new single currency euro has become an anchor for the other currencies participating in the ERM-II. Participation in the ERM-II is voluntary and the fluctuation bands remain the same as in the original ERM, i.e. +15 percent, once again