Not to brag but found a few worth at least £15 on ebay.... quite a few pre 1880 ones and a few restamped ones that are from around the early 20thC from the Weimar republic of Germany.

Which I find cool as fuck.

Reprinting is basically changing the stamp before it is actually used. The ones I found from the Weimar republic were changed, restamped because of inflation.

This one from 1923 (not mine) was 200 marks but was changed to 2 million.

One I found was 200 marks to 30 thousand.