This is not something extraordinary rare but 100 Dinara 1946 of Narodna Banka FNRJ is a great example of error printing and consequent correction during printing process.
This is the example of the correct original text on part of printed banknotes:
But there was also an a fault on the surface of the printing plate in letter Л (L) therefore banknotes with following text were printed too:
This error in letter Л reminded letter A. And this was probably a reason to make correction by brushing a part of printing place to get finally third variety of the text:
All of them you can find in current auction.