Contest Update: Clue #6 -- We have winner!

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.
3. He was a hitter.
4. He played an overwhelming majority of his career for a National League franchise.
5. This player had more than 10,000 plate appearances in his MLB career AND he hit a round-tripper in just over 5% of them.

For those of you lacking a calculator, Clue #5 equates to 500+ homers.

Here's your next clue:
#6. This player called three different cities "home" before eventually moving on to a different franchise.
 
Post your guesses in the comments section.  Again, you are limited to one guess on this post, and then you may guess again after the next clue is revealed, which will be about in another hour.  Good luck!

UPDATE:  Congrats to The Lost Collector on correctly guessing Eddie Mathews!
 Here are pictures of the front and back of the card:

  I love that this card features the very first Sports Illustrated covers.  How cool is that?

AJ, I'll be sure to send you something out on Monday for you!
Thanks for playing along this morning, everyone.   Enjoy the rest of your weekend.