This was one of the five random Cubs cards on Sunday. I commented on how awful his signature looked. Curious, I looked to see if he used the same signature on other cards. I found four other Cubs cards that used an autograph.
These are all Topps products and they appear to use the exact same signature, the same very legible signature.
Did he not like Fleer, so he decided to just scribble something for them?
Nope. It looks like the scribble is what he used at his autograph. My guess is that Topps got his signature when he was recruited by them as a minor leaguer. He hadn't yet developed his big league scribble. When other companies signed him, they got the chicken scrawl.