1967 Standups Mailday with a question

This came back in the mail today from PSA with an authentic grade. I purchased this in the winter Mile High auction I believe. I am unsure as to why it graded this way. Does PSA grade all 67's without perforations in this fashion? Any help or input would be appreciated. Thanks.

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Comments
I think I've seen some SGC graded ones designated as "unperforated"
BobF (bobsbbcards here) would probably be the one to ask.
on the other hand, who cares about the number on the flip? It's an incredibly nice speciman of a very, very tough card. The number on the flip is relatively irrelevant.
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
<< <i>I"m not positive, but I think so. For some reason I don't think they would grade them at all until relatively recently.
I think I've seen some SGC graded ones designated as "unperforated"
BobF (bobsbbcards here) would probably be the one to ask.
on the other hand, who cares about the number on the flip? It's an incredibly nice speciman of a very, very tough card. The number on the flip is relatively irrelevant. >>
Thanks. I was very lucky to get the card. I was just curious as to the pop report that lists most authentic and 2 of them have actual grades.
"Don't know the answer to your question, but that is one SWEET card. "
Thanks