Ptw lower receiver

For sale a ptw lower receiver. 

Manufacturer is unknown. Came to me in a box of random parts from a friend who quit Airsoft many years ago.
He used to have two systemas but doesn't remember where or what this receiver was. Maybe from a challenge kit?

As good as new, no signs of use. Comes with a selector.

Price 50€+shipping
Price is low and based on the cheapest one I could find because I can't verify the manufacturer. If this is original systema receiver you get a hell of a deal.

Located in Finland 
Shipping costs in EU are about 15-30€ depending on your location