[Eric72]

Originally Posted by sb1

One of the key aspects of determining if a T206 has been trimmed or not is to learn what the edges should like, sizes will vary, original cuts will not. There are tell-tale signs of how the sheets were cut into vertical strips and then horizontally into singles, which if one handles enough of them, can learn what an original edge should look like.

A 10x loupe is generally all you will need.

+1

This article by David Cycleback has been helpful to me. Hopefully, others will also benefit from it.

https://net54baseball.com/forum/content/trimming.html