That's a good question, Paul, as I have some modern cards that do this.
I've tried the penny sleeve + toploader, and putting a heavy book on top of the cards, and the curl remains.
We don't want to risk damaging the cards, but there has to be a way to straighten them out.
Suggestions, guys?
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Building these sets: T206, 1953 Bowman Color, 1975 Topps.
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