The currency of Croatia is called the Kuna (symbol HRK) and this has been the money there since 1994. Prior to the Kuna there was the Croatian Dinar which was around for only a few years after that country split from Yugoslavia.
The bank note below is a 1991 Croatian Dinar which was in fact the first year that this currency was printed. It features on its obverse Ruder Boskovic 1711-1787 (who was born there) whose contributions to science were great including atomic theory, first to find that the moon has no atmosphere etc. On the top right of this paper money are illustrations of scientific calculations. The back of this one dinar has the Zagreb Cathedral on it which is the highest structure in Croatia and was first constructed in 1093. This bank note from Croatia’s serial number is I6771378 and it has not been circulated. It is crisp with no wear and no folds.