It was imported by Interarms, and is probably a Mosin made in Finnland. I would go to some of the other forums, like the C&R one that I mentioned above, and do some more research. Parallax's C&R forums are good too. There are probably more markings on it that you can interpret that will better define which rifle you have. Email me if you need more help with it. There are plenty of people out there that know Mosins thru and thru, and could help you out.
The Finn Mosins are very highly regarded, and if you paid $150, that is a good price, if it is in decent shape. I'm not an expert on Mosins (I don't own any), but the Finns are as highly regarded as Persian Mausers, Swedish Mausers and maybe the Swiss K-31's that you thought you had earlier. They are very accurate rifles, meticulously produced and maintained, and there are several legendary stories about Finn snipers in WW-II, armed only with their Mosins with iron sights, sneaking thru the country side for months at a time, and sniping literally hundreds of Soviet troops. Sometimes making kills out to 600 meters with just iron sights. I've heard it said that the Finns really understood "The Art of the Rifle". Whatever you've got, the 7.62x54 round is cheap and plentiful so you should have no problem finding ammo and shooting it. Enjoy it.