Any HOFer starting their career since the 30's has a pretty common signature (Clemente being the obvious exemption). As you mentioned Koufax's popularity and lack of signing events make him more expensive but he's still very common. Mays and Aaron command high prices but are readily available.
The uncommon HOF autographs come from some of those starting their careers in the 1800's and passing by the 1930's and those from the negro leagues that weren't inducted until recently.
Last edited by bender07; 07-03-2012 at 08:11 AM.
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