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Posted By: davidcycleback

If you're talking about signed versus unsigned, the addition of the player's neat and nicely placed signature almost always raises the values. This applies to Goudey commons to modern stars. An example of a possible exception would be a Mint Pristine Perfect 1963 Topps Pete Rose rookie worth whatever thousands in its unsigned state, and where it might be safest to have Pete at a show sign your grade Very Good version instead.

Another example of an exception is if have a Gem Mint 10 1968 Topps Nolan Ryan rookie, where I would strongly advise you not to have Jerry Koosman sign it in gold paint pen with personalization to your Uncle Gunnar.

But, despite my attempt at humor, the addition of the player's signature increases the card's value is the vast majority of cases, whether the player is Ty Cobb or Jaimie Moyer. With Moyer, of course, we might be talking about raising the value from 2 cents to 35 cents.