I am contemplating sticking my toe into the forgery infested water of Berlin overprints.
I want to buy only BPP expertized stamps. Most of them I have encountered have a Schlegel expert mark. It comes in 3 types: (1) Schlegel BPP, (2) Schlegel A BPP and (3) Schlegel D BPP.
A quick look at expert marks https://www.filatelia.fi/experts/namess.html
seems to indicate that (1) and (2) are forgeries.
My questions for you experts are: Am I reading the website correctly? Is (3) legitimate?
I may just hold off and find some with paper certs from BPP
Any help would be appreciated.