How do tpgs generally determine a card is trimmed, by examining the edges under magnification alone, or by measuring as well? I know some cards there can be quite a bit of variance in their size (the white border set for example), but if a card was trimmed a few decades ago, would that not make detecting trimming more difficult?
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Building these sets: T206, 1953 Bowman Color, 1975 Topps.
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