As you may know, I collect stamps too. So I spend a lot of time in the Stamp Community forum.
Today I received two envelopes from members of that forum, containg these items....
2001 Guatemala 50 Centavos (1/2 Quetzal I believe)

Korean One Thousand Won.


Japanese One Yen.


Japanese 50 (haven't worked this out yet, but I assume 50 Sen)


This one's for Scottishmoney, a lovely on a Banknote. I suppose you have this one in your collection.
It will take pride of place in my Note collection.
Germany One Thousand Marks, 1910


Any help with info on the banknotes would be appreciated.