Those are cool collection and interestingly, comparing to Asia, the paper that are used to make banknotes are similar at least those issues around the 90s .I love collecting currencies and for european curries, I have some including Zloty. I think it's around 1Zloty and a few more laying somewhere. Perhaps, I need to take care of them because down the line,they could be a treasure when I reach 50 or something in like 23 years from today 🤣