Unfamiliar Mark On The Back Of Berlin Overprint Stamps

I've been deconstructing an old collection of Berlin stamps. I came across a marking on the back of the Berlin overprints (SC 9N1 – 9N34) that I've never encountered before. They are all stamped "Alfred Lippschütz" with GPSY in red underneath:




Generally a Lippschütz marking is considered a forgery although he apparently did some independent expertizing of Berlin issues.

https://briefmarken-pruefer.de/de/1...schuetz.html

I'm curious about the "GPSY" marking in red underneath. Is this another independent expertizing mark that I'm unfamiliar with or a collector's mark?

Unless I have a photo cert from BPP, I consider them highly suspect. There are many different forgeries of these issues. I'm just curious about the GPSY marking.

Any information would be appreciated!
Thanks!

Dan

Lippschuetz was an expertizer for Berlin stamps.

The GPSY stamp is an additional expertizing mark of Dr. Werner Bohne of the Germany Philatelic Society (USA).

My internet search shows that there are forgeries of the Lippschuetz marking. So, Dr. Bohne gave his opinion that the stamp and marking are genuine.

The GPSY signature may be a forgery. It does not look like the genuine signature, especially the "S". The following is from this website: https://www.filatelia.fi/experts/index.html

Germania,

You are about in the same place I was before I posted. The website you referenced is my source of information too.

That site seems to indicate that all Lippschütz marks are forgeries. The digging I did seems to indicate that isn't the case. (see my link in the previous post). That made me wonder if that site isn't as comprehensive as I thought.

That's why I threw it out for discussion.

Dan

Here are two (ostensibly) Dr. Bohne markings from my "BERLIN" overprints collection.

Since I did not submit these stamps to Dr. Bohne for expertization, I don't take them seriously. Stamps were purchased from APS circuit books.

Bookbndrbob,

You are providing evidence that the website I relied on for forged markings is, at best, incomplete.

Experts do change their marks occasionally. Of course they can also be easily forged. That is why I generally don't rely on them for accuracy. I would think that a potential forger would try to copy an original as closely as possible.

What made me curious about these stamps is that the GPSY marking is in red, something I've not seen before. What forger would advertise like that?

They may all be forged.... the quest continues!

Dan

I posed the same question to the Germany Philatelic Society that I posted here.

There appeared to be some discussion but the following seems to be the consensus opinion: (Names are omitted)

"I'd give the genuineness of the item (s) a very high rating. Although the overprints have been extensively forged, Dr. Bohne always sent anything submitted to the proper Bund expert. Hence that gpsy signum indicated that the material had been through that submission. btw, I'll disagree with ***'s comments about the gpsy signum, in the early days (pre about 1970 or so) before the Bund pruffer organization had been established, the gpsy did, indeed, indicate Expertization."

Obviously, the only way the question can be resolved is a BPP certification; the GPSY could be forged as well but I thought this information may be of interest to the group.

Dan