How Do You Actually Know It's Trimmed?

[tbob]

Since PSA has no clue if a card has been trimmed, and they are supposedly experts, I don't know if there is any fool proof way of telling. You just go with your gut feeling, experience at looking at many cards through the years, etc. Many pre-war Registry cards with PSA 8s and 9s appear trimmed to these old eyes.

[T206Collector]

This is hard to explain in writing, but you must look at the edges of the card while holding the card flat to your eyes. The card should look like this when you are examining it:

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If you are only looking at it from the face/front or back, you are missing many of the tell-tale signs.

You cannot just measure a T206, for example. You have to look at the flat sides/edges. If you ever have the chance to compare a trimmed edge to a not trimmed edge the differences do jump right out at you.