So one of the tells would be to look mostly at graded/raw commons from this issue, and determine the average width of this issue on cards unlikely to be trimmed. Once you figure out if the width difference is within 1 standard deviation, you can say it's got a better chance of not being trimmed. If the card on the left has a standard deviation of 2-5 sigma, it's very likely to be trimmed since it's so far outside the standard factory tolerance for the issue.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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