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PaulMost undervalued:  C46 Imperial Tobacco McGinnitty and Kelley.  (I agree the M101-4/5s are also undervalued).
Most overvalued:  If I can break the rules and go just past 1930, I'd vote for the 33 Goudey Ruth in very high grade.  This card in PSA 9 sells for the same as the 33 Lajoie in the same grade.  That's just not right.