That M70 Target rifle may have a Dunlap style stock but it is not an original Dunlap rifle. I knew and shot with Roy on occasion. I have seen many of his rifles on the firing line though I could never afford one. I doubt very much if a Winchester collector would have much interest in a highly modified target rifle. The stock is not a Winchester original and the rifle has, in my opinion been re-blued. At one time, the Winchester M70 rifle ruled the high power ranges but in recent years, I believe that it has fallen in to disuse. I have not fired in a high power match in ten year so cannot verify this. The value of that rifle is dependent upon its accuracy and what it is to be used for, The rear sight appears to be a MO'S precision rear sight and the front sight is sight containing a bubble level for long range precision shooting. I cannot think of the manufacturers name at the moment. If the rifle retains its accuracy, it is probably OK for big bore rifle matches but may not be competitive. If it maintains it accuracy it is well worth $425. To the high power shooter-handsome is as handsome does. A rifle is a tool of the trade for him/her.
I agree with vintage hunter. The M70 NM rifle is a rare bird indeed. In over 50 years I have only seen one.
There were three versions of the M70 target rifles:
1. The M 70 NM (Essentially a M70 sporter in a Winchester target stock to meet NRA rules). Always in 30-06 caliber
2. The M70 Target (the same as the NM with a medium heavy weight barrel -probably the most numerous)
3. Them M70 Bull Gun (same as the Target except with a very heavy barrel and in 300 H&H & 30-06 calibers). I have one of these in 300 H&H
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FWIW