Hi!
I reckon it's time to add more countries and territories to the list, so I don't have to choose "Unknown" a little now and then.
Countries I find lacking are:
Europe: Czechoslovakia, Faroe Islands, Greenland, Kosovo, Soviet Union
Asia: Abkhazia, Korea^, (Portuguese/East) Timor, Tannu Tuva, Tatarstan
Africa: Rep. Congo*, DR Congo, Mayotte, Réunion, Somaliland, South Sudan
Australia, Oceania: New Caledonia
Caribbean: Montserrat
South America: Antarctica(?), Easter Island(?)
^Banknotes issued before Korea split in two, should I add them as South or North?
*Now both Congos (Republic of the Congo, and Democratic Republic of the Congo) are mashed together as "Congo". This, I reckon, is incorrect.
Any other countries/territories that you're missing?