You can tell
You can tell how recently a card was cut. Unless its a really thin issue this is much harder to tell sometimes when the trimming took place. Ther is a measure of toning and opening of pores of cardboard on the edge when viewed upon magnification on an older trimmed card. For strip cards to grade you can usually bisect the line and still get number grades on both. I usually wouldn't recommend this as you have to be very precise or you might end up with two A cards.
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