My guess is that it was done here. The only legit blued bolt rifles I have ever seen in Finnishservice were those that the Germans sent over in 1944 for parts. As for the rifle itself, its a mystery. Its not a P-Series unless it says P-25, P-26, or P-27 on the barrel. A lot of people like to say that rifles like this are unmarked P-25's, having seen a few P-25's in person, I can assure you they actually say P-25.
Congratulations on the find.