Personally, I wouldn’t take less than $1000 for it. That may mean I end up keeping it for a quite a long time. But it’s growing on me, and my son enjoyed shooting it to.It is true, that on old 19th century and some early 20th century guns, any refinishing hurts the value especially if they have a documented history behind them. But mid to late 20th century firearms usually bring a better price if they are factory re-finished.
I have a 1978 Ruger 44 carbine. It's about 95% condition I was thinking about selling it so I looked on Gun Broker to see what they were going for. Comparable 44s are going for $1200 -1500.
Yours is in rough condition. Because it has the original DeerStalker stamping a collector may give you between $500 -1000. It will depend on the collector. In my opinion I would send it back to Ruger and let them refinish it.