Need Help To Identify A Stamp.

Not sure if this is a stamp or something else. Your assistance to identify this with a Country and Scott Catalog # would be appreciated........

Guess
Cinderella (Austria)
HARAND MOVEMENT (Irene Harand)
Anti Semitism
https://en.wikipedia.org/wiki/Irene_Harand

Prof Paul Ehrlich (German Jew)
https://en.wikipedia.org/wiki/Paul_Ehrlich

The "20" would perhaps be a 20 Groschen donation to her movement.

To the OP, seeing as you've posted several non-stamps, a quick tip: 99% of anything you come across that can be rightfully called a "stamp" (whether postal or fiscal) will have at least one of the following: a clear or obvious value printed or marked on it, and the name of the issuing authority or government. It may not be in a currency you use or a language/alphabet you can read, but it will be there.

The biggest exception to the rule that stamps will have the issuing country's name on them is the United Kingdom. Their stamps will show the head of the reigning monarch, currently Queen Elizabeth II. Usually found in an upper corner of the stamp on commemoratives.