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1950 Callahan Question's

Hello Everyone,

I have some questions regarding the 1950 Callahan set. What is the differences in all the variations? I've seen quite a few of these awesome cards that claim the be of the different variations that look identical on front and back. Would PSA make a mistake and mis-label one being the other? One for example is the George Sisler, I've seen a PSA graded example of both variations and they both look and read identical. Am I missing something here? Or, what's the deal here?

Thank you,

Jeff
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