It looks as if there may be a small amount of paper loss on the bottom right corner. I have a PSA 3 of the same card, and that is the only difference I can see. It may not even be paper loss.
If you look at the back along the bottom, you can clearly see where the red "Big League Chewing Gum" bled through from the card it was stacked on top of for 50 years.
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