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Are the two underscores meant to indicate missing or illegible characters, or is what you wrote what you actually see stamped into the scope? It's not familiar to me, but in the 70's some large hardware and department store chains still had custom branding on guns and accessories that you don't see now. I'm wondering if you got one of those?
Sounds like a Redfield brand Widefield scope. Bought out and gone some time ago. They may have OEM'd the design for a supplier in the 70's, though. Chuck Hawks has some information on them, but I find him sometimes a bit careless with facts, so double-check any critical details that interest you.
try looking on the underside of the scope back near the occular and see if there are any markings there, if so post what you see. such as country of mfr, midel # and any initials or company logo's or what not. i can't find anything listed in my reference book with any refeerence to BA--NGER as a sub model to any particular mfr.
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