1: Following up on the Clay publicity cards, there was a segment on Antiques Roadshow on Monday about one of these. The guy brought in a Clay publicity card with a different pose that he'd gotten from Clay when he was a boy in Miami, before the Liston fight. His was signed. It also had the facsimile stamped signature, which the alleged expert mis-identified as a fountain pen signature. Had me yelling BS at my TV set...I hate it when they make obvious mistakes on that show.
Here is a link to the video:
https://youtu.be/yAMCzLbRjsU
2: On the magazine cut out question, here is a different set from Fight Beat Magazine:
They are touted on the magazine cover as cards, are labeled as cards, and have dotted lines to cut out.
3: Shindana Games in a slab
does look nice:
And for something even crazier, I found a cabinet card sized version:
I'm not sure if these were proofs, store displays, prototypes or what, but a near set turned up, found in an estate sale in Michigan.