if the player died before the mid 80's, their signature will be a lot less common than if they lived later than that, because their participation in the autograph show boom would be more limited.
maris just missed out, only doing 1 or 2 shows or private signings. so obviously robinson, clemente, even greenberg, less autographs than if they would have lived to late 80's when it really took off like gangbusters.
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