I had a 1974 Seaver OPC but sold it. Nice card too.
That Mantle exhibit is probably not from a poster. If it is on slick thin paper and machine cut it is more than likely made for attaching to the machine headers. The company printed cards on that kind of paper, probably because it was cheaper and lighter than card stock for the advertising pieces, which were offered to vendors as freebies. Many times more difficult to find than a regular card. If it is on thicker cardboard but not like a typical card and is handcut or of a dimension different than a standard card, it may be some kind of interim production item. I have a few of them from the early 1950s.
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