I just had a discussion with Ted Zanidakis regarding this last week. According to him, the Mantle was printed on the uppermost left corner on its 72-card sheet. Therefore, some Mantle cards may be slightly narrower than 2 1/16, while others may be slightly wider than 2 1/16.
I doubt his card is trimmed, especially with those rounded corners, but just to be on the safe side, just measure it with one eye closed. I hope you have other 51' Bowmans in PSA cases, so that way you can make comparisons.
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