I thought Bob was only talking about cards that had been in screwdowns for "several decades." Back in the 80s not sure if people were protecting cards with a sleeve, or taking care not to overtighten the screws, so it wouldn't surprise me if some of those will be worse for wear when removed.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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