I imagine cards are fabricated by the manufacturer to a certain length and width using nominal values for each. Obviously, the nominal value is not going to be hit during the entire manufacturing period so there will be some differences. Where does PSA find these tolerances? They have to know what would be considered undersized for a certain card set or are they not measuring at all? How are they are measuring? Read all sorts of posts over the years where somebody who has pulled the card from the original pack submitted it and it came back not meeting the size requirements.
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