I'm sort of assuming that at least one of the two 7's would have been a PSA 9 OC, but the submitter checked the 'no qualifiers' box and it became a straight 7...but that's just a guess.
The explanation for the two 7's could also be that there is a surface issue that can't be detected in these scans. In my view, the best comparison here is between the 9 and 9oc under the assumption that a 9 has no surface issue regardless of the presence of a qualifier. Here are my guesses:
1. 9oc
2. 9
3 and 4. 7's
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