just want to share with you my recent acquisition. "H.A. stempel." As far as I can find ( thanks Ludger) it was an experimental stempel, used in a really short period. This one seems to be the earliest known use.
However I posted here since in the back, has this "Börse" stempel. I never saw it and just want to know if anyone saw it. Got it.
Thanks in advance for the information, and sorry to write in english (I don't speak german).