There are really two aspects to this: rarity of the card and rarity of the signature. If you want a signature on a specific card--like I collect signed exhibit cards--then even a relatively common signer can be hard to find. Jack Dempsey is the most common prewar heavyweight champ but I've never seen a legitimate signed exhibit card.
Last edited by Exhibitman; 12-18-2013 at 07:17 AM.
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