I think it's been pretty well documented that the player likeness used for the MLB logo shown above is Harmon Killebrew, even though in a 2009 interview the designer of the logo claimed it was not. Read it HERE.
Regardless, what has not been established is who the pitcher was that threw the ball.
Or, better yet, whose ball is that approaching (or leaving) Harmon Killebrews alleged likeness?
Well, based on a 1991 Fleer logo sticker I came across recently, I think the pitcher must have been having a bad day because the Killer smoked his pitch. Here's what I'm talking about:
The pitcher that Killebrew owned the most was Jim Lonborg:
29 AB, 14 H, 6 HR, .483 BA, 1.138 SLG.
So Jim Lonborg was the pitcher whose likeness the ball was designed.
Did I say that right?
Found that sweet, rubbed off logo on this card.
Pretty cool huh?