The only thing I can add is when researching the classic Diana/Milbro Mk IV pistol I became aware of a 1970s pistol that was stamped PERFECTA + the F within pentagon on the forward left side of the cocking lever. Undoubtedly exported to Germany.
I wonder if a continental collector that has contemporary catalogues can add any more detail?
John
Currently looking for Baikal Makarov pistols with the following prefixes to the serial number: 98, T01, T09, T21, T22
Prefer boxed or cased but will consider loose examples too.