Li ha gatekee mantenerli fin dall’infanzia. Sono rari?

You can research this yourself, like:

https://www.google.com/search?hl=en&source=hp&q=20+millionen+mark+d%C3%BCsseldorf

Or just go to ebay.de/com, type in the major information of a note and then compare the images of the search result with what you got.

Isn’t the guy on the 10000 Mark note the same who later appeared on the 10 Mark note?