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HankronTodd is the acknowledged expert on this issue, and I wouldn't know a Famous and Barr from a chocolate bar (Actually I would, but you get my point). As far as fakes go, in person examination will quickly differentiate between a modern made reprint/fake and an original. http://www.cycleback.com/baseballcards/7.html (Zoom past to bottom half of page, 'Relief')
So if there are theories that this or that is a legitimate variation and not always a reprint, it can be put to the test.