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They are not a copy of a PPSh. The closest they come to a Russian smg is a vague resemblance to a PPD 38.
Anyway, they are made by Pietta in Italy. They are nicely made, decent quality little .22s.
The PPS-50s seem to have a sort of generic first generation SMG styling rather than being a copy of a particular gun. To my eye, they also look a little like a Suomi M/31 or Beretta 38A as well as a PPD.
I like mine, had to break it in over a few thousand rounds but now get flawless 50rd mag dumps. I think if I put a scope on it I could be quite precise with it.
Get the wood stock option, I would if I had a do-over