A good magnifier and knowing what to look at as far as the printing and edge quality goes will detect most of them.
Blacklight will pick up a lot of them too.
After that it gets a bit tricky.
I don't have the number handy, but at one point I measured the thickness of several T206s and they were all the same. Within reason, I didn't look beyond thousandths of an inch, and given the tech of the day I'd say +/- .001 is reasonable. If I remember it correctly there was no difference in any of the ones I measured.
Just seeing a lot of originals up close is probably the biggest thing. After a certain point, the ones that are "wrong" will be more obvious.
That's also something I don't have much advice on. Most collectors who started a long time ago have probably held more T206s and other prewar cards than most newer dealers have seen. One show I went to there were probably 5-6 dealers who had between 50 and 100 in stacks. Not even a plastic holder. That just doesn't happen today.
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