Contest Update: Another Clue

Up for winning some cards of your favorite team?  I posted a question earlier this morning about my humble little collection: Who is the only other non-Cub, certified, on-card autograph of a Hall-of-Famer in my collection?

Here's what we already know:
1. Not a Cub... this is not very helpful, as that narrows it down to 29 other franchises.
2. He's in the Hall of Fame.

Here's a new clue to help narrow it down a bit:
3. He was a hitter.

Post your guesses in the comments section.  Again, one guess per blogger until the next clue is revealed, which will be about in another hour.

Good luck!