I was used by Unit 77....
Where'd you come up with that?
I'm not sure it's a Russian refurb, since the Russians wouldn't have stamped those corresponding numbers on the bolt and floorplate.
They would have electropencilled the metal parts instead. It almost looks like a Russian refurb that bubba tried to renumber.
The floorplate looks like it has been scrubbed of original numbers before being restamped, but the bolt almost looks like it's still bearing the original number, however I'd need better pics of the serials to confirm that.
The eagle 77 means that the floorplate was made at the Radom plant in occupied Poland. it has nothing to do with what unit the rifle was issued to.
As for the stock, looks better without the stain in my opinion. I'd just rub a little Howards Feed 'n' Wax into it so its not so dry. Being a '44 vintage it probably didn't see heavy use. I bet it'll make a great shooter.
As for price, it's difficult to judge until we determine what sort of refurb it is. If it were an untouched Russian refurb, they're going for $375 at Canadian retailers. The value of yours will depend greatly on whether or not someone dicked with it to put those numbers on the floorplate. If you want a better idea, and you have a camera on hand, post some better pics of the whole blt, including the serial number on the handle, the cocking knob, safety wing. Also, the barrel band and triggerguard if there are serials. Finally, the whole receiver (serials on side of receiver and barrel), and the numbers on the rear sight.