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Rob LI think these can be authenticated if the authenticator knows what to look for. Unfortunately a 10x loupe is not going to do it. David's work on detecting the photoengraving process indicates that a 100x magnification would be necessary to discern the imprint of the engraving as well as the darker edge around the dots. I have seen several Fro Joys that appeared to be correctly slabbed as authentic by Beckett, but that's it.
Rob L