I would crack it. Long ago I purchased a '63 Stargell RC off Ebay. It was graded by some company named CSA as a NM-MT 8 in a slab that looked eerily similar to PSA. It is a really nice card that is dead centered but I was always suspicious of it but got it for a great price so left it in there. I recently decided to crack it and submit to PSA. I measured it and it looked OK to me but I would not have been surprised if PSA rejected it. To my pleasant surprise it came back as a ExMt 6. I would do the same for yours. It is a liability being in that PRO holder.
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