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T206Collector. . . concentrate on cards that grade SGC 80/6 or lower. Of course, it helps that cards graded higher are way too expensive. But, I actually look for even corner wear as a sign that the card has not been tampered with. I do believe that an inappropriately high percentage of vintage cards that have been graded above an 80/6 may have been tampered with. Sharp corners on a T206 card always raise my level of concern.
Given my grading experiences, SGC is the most conservative of the three major grading companies when it comes to T206 cards. GAI 'tweeners are routinely crossed over into a grade or worse lower. And about 25% of my PSA crossovers (with over 40 submissions) came back either a grade lower or EVID TRM from SGC.
Determining whether a card is trimmed or altered is not an exact science. When you dabble in sharp cornered cardboard from before the 1st World War, your chances of getting a trimmed card in a graded holder goes up exponentially. Buyer beware...