I was checking out some 1964 Topps Giants and I saw something interesting. With the amount of time dedicated to discussing all things Mickey Mantle around these parts, I have to assume this variation has already been discovered, but what the heck, I'll post it here anyway in case it somehow slipped through the cracks.
There are two cards pictured in this gif and the most obvious difference between the two is that dark crop line going across the bottom of one of them. It is very evident passing over his left arm. But there are also great differences in the cropping of the photos and the positioning of the decorative baseball.
The card with the dark line is much more easier to find than the version without it.
I also found cropping differences in a few others, including Al Kaline, Ron Hunt and Harmon Killebrew. Does anyone know if there are similarly relevant cropping differences in each of the cards in this set?? These guys don't seem to be discussed too often.