From Wikipedia:
The Czech koruna replaced the Czechoslovak koruna when it was introduced in 1993, after the dissolution of Czechoslovakia. It first consisted of overstamped 20-, 50-, 100-, 500-, and 1000-Czechoslovak koruna banknotes, but a new series was properly introduced in 1993. The coins were in denominations of 10, 20 and 50 haléřů, 1, 2, 5, 10, 20 and 50 korun.