In 1919, Czechoslovakia introduced its own currency - the koruna (crown). In the year before, the country had become independent, and shortly afterwards it replaced the Austrian crown with a new one, for and from this new country.
That country was split up in the nazi years, then became one again, until in 1992/93 the Czech Republic and the Slovak Republic went separate ways. But the koruna is still the Czech currency, and the country will celebrate that next year, also by issuing various commemorative coins and notes. Here is the program, from the central bank's
Koruna Anniversary page:
* a heavyweight gold CZK 100,000,000 coin "100 years of the koruna"
* a gold CZK 10,000 coin "The 100th anniversary of the introduction of the Czechoslovak koruna"
* a commemorative bi-metal CZK 2,000 coin "The 100th anniversary of the introduction of the Czechoslovak koruna"
* a commemorative CZK 100 banknote "The establishment of the Czechoslovak koruna"
* a CZK 100 banknote with an additional print "The 100th anniversary of the currency separation"
* a commemorative silver CZK 500 coin "The 100th anniversary of the start of issuance of Czechoslovak money"
* circulating CZK 20 coins "Personalities of the Czechoslovak currency" (Alois Rašín, Vilém Pospíšil, Karel Engliš)
No further details known yet. But collectors who want to be "complete" will have to spend a lot, I think ...
Christian