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Eric BI assume the black border is always the same for all T206's, regardless of the outside cut. If, for example, the width of the inside black border is always 1.20 inches compared to the average card size of 1.40 inches, then we know a T206 should always have roughly a 120 to 140 ratio.
Then a scan of a famous card, the McNall Gretsky Wagner comes to mind, can be measured on a PC. Just pull it up, see how many units (whatever photo program you use) wide the black border is and compare it to the full card.
So if you measure the black border to be 360 units, and the whole card to be 400 units, you can figure out the card width is 1.33 inches...definitely trimmed.