Great post and very interesting thing that Notgeld. I am German and in my childhood I got some of that paper money. I liked it, specially the notes which were overprinted because of the rapid change of vallue. And I liked the BIG numers on it (compered with my pocket money.)
Have you ever heard about Specmilo- the Esperanto currency. It was a kind of universal remidy like the international language. Unfortunately it didn't work out. Bitcoin kicks in now globaly...
Thanks and take care.