Take a loupe and check the outsides edges of the card; look at the part you wouldn't be able to see if it was slabbed. If the card has been trimmed recently, you'll see uneven oxidation. The recently exposed portion will be "cleaner" than the other edges.
I realize this is just one of several methods to check for trimmed cards. However, the fraudsters rarely "age" this portion of the card after their trim job.
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Eric Perry
Currently collecting:
T206 (132/524)
1956 Topps Baseball (190/342)
"You can observe a lot by just watching."
- Yogi Berra
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