I have owned two Ruth RPPC's (not the same image as yours) with period-legit backs, that were both fakes. Both were good enough to fool another knowledgeable collector and to almost fool me, but I sent them to an auctioneer who handles such things regularly, and he said "they do not look right" and sent them back to me. Now I own enough examples of each back that I could spot these fakes quickly by comparing to real ones, but if all you have is the fake, it can be tough.
Hope yours is real.
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