I know this issue is rampant for counterfeit despite not being that valuable, but this seems like a double attempt perhaps?
Collecting used/mint Botswana, Germany, Ireland, Scandinavia (need most from Aland, Iceland & Finland), Tonga (1960s/70s) and Austria. Topicals of Owls, Holograms and books on stamps. Latin/South America issues from the American Bank Note Co. I also enjoy a fun gimmicky stamp, like the ones made from fabric for example.