These cinderellas came to me as a gift a couple of days ago. They appear to be varnished — I have never seen stamps or cinderellas that have such a high-gloss finish. The gum is very glossy as well, if it is gum.
The back of each Cinderella has the same inscription as this one:
My benefactor doesn't know with any certainty what they are. He wrote, "Cinderella stamps from Moravia (suspect just prior to 1938 Sudetenland crisis). As far as I can determine these were issued by the League of German-Speaking Moravians. Had trouble with the word 'Wordmahrens' cartain Mahrens portion refers to Moravia but could not find 'Word' in any German dictionary or on the internet. Also could not find any reference to these Cinderellas or the 'Bund der D.W' anywhere."
He also mentioned that he bought them from an elderly Austrian dealer, but was never able to inquire about them.