The Slovak koruna or Slovak crown (Slovak: koruna slovenská, Ks) was the currency of the Nazi-era Slovak Republic between 1939 and 1945. The Slovak koruna replaced the Czechoslovak koruna at par and was replaced by the reconstituted Czechoslovak koruna, again at par. Initially, the Slovak koruna was at par with the Bohemian and Moravian koruna, with 10 korunas = 1 Reichsmark. It was devalued, on 1 October 1940, to a rate of 11.62 Slovak korunas to one Reichsmark, while the value of the Bohemian and Moravian currency remained unchanged against the Reichsmark.