it looks as they have taken a top plate for an export Zorki-Zorki and engraved the Zorki 2 name :-) I have never seen or heard of it before. Nice find.
I think you are right about Zorki-Zorki top plate. I have heard about export version of Zorki-2 camera before, even more - this type is described (mistakenly) in Princelle book p.130, but I have never saw it alive ... And now I'm the proud owner of this real camera ...
BTW the particular camera was found in Germany ...