This is a type-III bolt housing from a 1965 magnum caliber rifle. The bolt grades at NRA very good condition with some bluing wear on the handle, but no significant metal damage.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE
NOTE: While model 70 bolts may appear to be interchangeable, to safely replace the bolt in a rifle requires the action to be checked for proper headspacing and lug seating. This is a simple procedure which can be performed in a matter of minutes by a qualified gunsmith.