GAI and SGC slabs do usually leave enough visible to examine a cards edges.
PSA will often block some of the edge of a full size card, undersize should be visible.
I'm not sure about Beckett. It's been a while since I looked at the one or two Beckett cards I have.
Even the Acu-Grade slab shows more than enough edge to tell if a card is trimmed. (Unfortunately for me, or not one of my Delongs is Acu-Grade 7, and it is trimmed. Of course, if it wasn't I wouldn't own it... )
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