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qualitycards.comTo some purists a card with a signature devalues the card since the card now has writing on it. Prior to Mantle's death I saw many good deals on his late 50's Topps cards that were signed. The Mantle card collector or set collector didn't want a sig on it and the Mantle autograph collector would rather have a signed ball or a photo to display. So the signature added little value.
It would be interesting to check the values of pre war vintage cards and see how much of a premium a Tris Speaker signed T206 or a 1933 Goudey Heinie Manush would fetch...jay