This is called "Instruktionsmarke" (instruction stamp) which was used on the front of stamp sheet folders (Bogentasche) to show what kind of stamps are inside. So no postal stamp, but a nice philatelic finding.
Here is the picture of such a Bogentasche - unfortunately not the 6 Kreuzer - and the link to the page where they write about it (in German).
I disagree ... no one would pay a cent for a simple cut out from an old catalog page. These "instructions stamps" are mentioned in the Michel catalog and are wanted auction items.
Danko; The stampX-Forum post you indicated;with the forged 6 kreuzer blue next to the 6 Kreuzer whitish paper . The original booklet was whitish paper with the 6 kreuzer on the cover.
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Posted 06/05/2020 01:13 am
