Hex receiver, Fin re-arsenaled M91/30.
Original mfg. year was 1943 at Tula.
It doesn't look like its in the greatest condition - I've seen better but I've also seen far worse. One thing that bugs me is that I can't see from the pictures if the stock is a Finnish redone stock. The stocks redone by the Fins are tell tale - the have a joint mark kind of like this /\/\/\ on the stock all the way through it. I'm not sure if all of them have it but all the ones I've seen that were Finnish had it and I've handles about 40 of them.
Regardless in the relative condition your pictures portray of the rifle I'd say you've got a $200 to $300 gun right there. It'd be worth closer to $300 if the bore were bright and crisp... if it were in better condition and if the stock were a Finnish stock then the gun might exceed $300 in value upwards of $360 or more.
If you got it for $30 then you got a hell of a deal!