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Joe D.david is correct about the moire pattern as a sign of a fake (for instance on T200s)
I just wanted to point out that the absence of a moire does not prove anything... and should not give a person confidence that an item is authentic.
It is very simple to remove a moire pattern from a scan. If a person is crooked enough to sell a reprint as an original, they might also fudge the scan and remove the moire.
So... like David said - if you see a T200 with a moire it is fake. If you see one without a moire... it doesn't mean much.