The MR prefix is a good indication that it's a Magnum Research gun. Most of the Magnum Research .308 ARMs I've seen didn't have a rubber pad on the folding buttstock.
It's a pity; a member by the name of Darkest2000 had some incredible photos of a pair of early MR ARMs in the Official Galil Library thread. I was going to point you towards them but it appears he's taken them down. However, there are still some great photos of a MR Galil by member Galil30 - page 4, post #77 in the same thread. Is this what your Galil looks like?
Given that it's an early Magnum Research Galil, and has the right kind of bayonet lug, etc, etc, I would say it's worth in neighborhood of $3,400.00......... at least that's around what I'm planning on paying in three or four months (there's so much stuff coming on the market right now that I'm being bled white).
It would be helpful if you could post a photo,..... or at least more info; does it come with the box, documentation and accessories? Does it have a rubber pad on the buttstock? Is the firing pin spring loaded? etc, etc, etc.
V.