The cards have some sort of symbol toward the bottom of the player's photo.
Does anyone know what it signifies?
Even with a magnifying glass, I'm having difficulty making it out.
It appears to be either IF or IP inside of two circles with an 'S' to the right.
Here's my Walter Johnson as an example:
WALTER JOHNSON 1922 E120 American Caramel - PSA-5.jpg
I have other E120s and they have the same symbol.