While 5 is the midpoint, I've always thought of midgrade as vg through ex-mt. Or 3-6. Sub-3 is low grade, off-grade, OBC, or collector grade. Whatever term you like. 7-8 is high grade, 9-10 is registry bait. That would all be for pre-1974 cards. Once you get into the 1974-on, I'd say there is basically no collectability below a nice looking 4 unless it is one of the really expensive RCs from the era. The rest is basically dollar box fodder. After 1980, the cut-off is basically a 6 or a 7, except for a few cards (1986 Jordan, 1979 Gretzky) that people will buy. Modern era (1989+) there is no midgrade or low grade; if it ain't near mint or better it is basically useless.
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