Depends on the era. If you were building a set of "modern" anything, you'd want nothing but 10s... A "high end" set of 50s-70s could be 7+. But I think "high end" for pre war stuff, has to start around 5. Simply considering the lack of protection the cards had for the first 50+ years, it seems logical that the vast majority show just general aging that decreases them to 5 or worse.
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