I've seen some say versions of this: That players' card prices are proportional to the skill of the player, so if the numbers say player A (maybe Henry Aaron) was as good or better than player B (Mantle?), then if his cards aren't the same price, they are "undervalued."
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198/240 1933 Goudeys (Ruth #144, #149, Gehrig #92)
136/208 T205s
47/108? Diamond Stars
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