Pressing
I know the card market does not like any restor work, but I doubt a professional pressing could be detected. The comic grading company CGC can not detect when a comic is pressed so I see no reason why PSA could.
I would suspect a chemical cleaning if it is not trimmed. I would say crack it bring it to SGC at a show to do on site grading if they think it was altered you can at least find out what they think is wrong by asking the graders.
James G
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WTB Boston Store Cards esp Ruth, Hornsby and 1915/16 UNC Strip cards and other Boston Store's too.
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