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Marc S.it may be tough to tell. I don't believe any of the major grading companies currently grades Fro-Joys because of the ambiguous nature of the reprints vis a vis authentic examples. Obviously a scan would help - but 99.9% of the black and white Fro-Joys out there are fake - and your item will not realize any value unless you can get a major auction house (for example) to vouch to its authenticity.
Previously, Runscott has posted a picture of one of his authentic examples:
