I've used and owned M-70's since the early 70's. I have had post 64's and my last 3 are the newer CRF FN made in SC . Ironically I just bought my first pre 64 M-70 of 1960 vintage in 300 H&H. It is still in the mail, should be here in the next few days. The pre 64's were coveted because of the control round feed, 3 position safety, and general reputation of being well built rifle. Hence the it was given the title the "Riflemans Rifle" . From 1964 on wards Winchester cheapened there whole line to save costs. the M-70 went to a push feed style bolt and generally cheapened the rifle so it was only a shadow of it's former self, especially the late 60's vintage rifles. The years went by, the quality of the rifle improved to a point. Winchester went through many restructuring and ownership changes.
About 10 yrs. ago or so they started manufacturing the M-70 again with CRF. And the M-70's built under the FN flag in South Carolina are some of the best made M-70's ever produced including the pre 64 vintage rifles.
From the looks of the one in your picture it appears to be in very good condition. Hard to tell from the picture if it has been redone or just well cared for and loved over the years. Yours with the longer heavy contour barrel and absence of iron sights is probably a varmint model. Appears to be a standard grade stock with raised comb and no cheek piece. My newer feather weight M-70 in .243 gives me 1" groups with my reloads out of a light contoured 22" barrel, so yours should out of a 26" heavy barrel with good reloads should at least match the accuracy of mine, hopefully better.
I am no expert on Winchester M-70's by any stretch of the imagination, I just like them, always have. Shot a lot of moose with my early 70's push feed in 30-06. So there will probably be someone else of more expertise chime in here and add some info I have not included.