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Help in valuing a Montana blank back proof card

DblbogeyDblbogey Posts: 4

A friend picked this up at a flea market long ago, He's not really into cards, and wonders what it might be worth. It's a 1990 Pro set Joe Montana, his regular card - but after a bit of research, I discovered it's a Proof card. The back is blank. I saw a 7.5 actually sell on ebay for over $700, yet see an ungraded one listed for $49. It seems very few are listed or sold. Any ideas on price? I believe it would easily grade as a NM.


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