I am looking at the magnified images of the 1956 Robinson obverse. Those do not look like pin holes to me. They look like raised areas or bumps within the cardstock/ paper pulp. I think that those particular images are of chunks of material within the pulp that were manufactured when the card was made. I have seen this before on vintage. As for the 56 Clemente I don’t see enough detail on the provided images.
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