Need autograph help ...

OldCardBuyer

I recently purchased this ball at an estate sale and am having difficulty figuring out one of the signatures - the one above Jim Catfish Hunter and Warren Spahn. Also on the ball are Fergie Jenkins, Clete Boyer, Tommy John and Lee May. Any help would be appreciated.

OldCardBuyer

scmavl

Is there a theme to the ball? I was thinking pitchers but Clete Boyer being on there throws that off... Hmm...