Calfed,

Glad you didn't spend too much. The stock might be pretty good under the gunk. Looks like it is a Remington or Smith Corona 03A3. Ya' can tell by the front cut for the lower band spring, square or round. Don't know which is which. The money in that rifle is probably in the stock if there are no cracks or major problems. Maybe the barrel is good also. Receiver is a problem.

You'd probably do best by cleanin' it up and hanging it on the wall or part it out. Might be some good money in the bolt if it is a rare one and is fit. I wouldn't put any money into it. Your other receiver is a late low number SA.
High numbers for SA's sorta' start at 900,000 and maybe a bit earlier. The big wheels will chime in on that I hope.

Good luck,

LB