Most of the scopes of that period and earlier used what looks to me more like a polished blued finish rather than the much blacker and shinier "gloss" finish that we see today. I have several old M70's that carry a Lyman Alaskan and have owned others with older 1" Weavers, typically a K4. None of those scopes have that really black gloss finish that is so common now.

If it were me, I'd look for an older period scope in good shape - there are still plenty of them out there, and they work just fine. Failing that, I reckon I would probably go with a matte finish modern scope, mostly because I don't care much for the glossy finish and I don't think either finish would be entirely correct for the period in which your rifle was built.

I would second the advice regarding military slings. They were dirt common back in the day and were often found on M70's. Then learn how to use it correctly if you don't already know.