So much of it with later signers depends on the card and the signature age. I know lots of collectors [me included] will pay a premium for a vintage signature on a specific card or card type. I love signed, postally used PCs, especially team issues from early in a player's career. Bob Turley isn't hard to find but a vintage signature on a 1954 Baltimore team issue PC mailed in 1954 from Baltimore, now you have my interest:
Ditto this Drysdale, which I've shown before, a 1957 PC, Brooklyn-mailed, personalized and hand-addressed by the Donald:
