Wow, I played a lot with those back in the day. Those were the former Jugoslavia currency called
dinar.
They were so denominated that when a friend's father came back from Jugoslavia, he gave away to all the kids in the neighborhood some bank notes just to play with. They had like 0 value, especially those with Nikola Tesla on them, I had a blue ones.
Found one
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2F6aup1bv.jpg&t=663&c=BTdU8RY61Ln19w)