Hello Steve,
Sorry, I can't give you a definitive answer. The Baseball Magazine posters checklist in the Standard Catalog has been there probably since the first edition and I don't recall any additions, corrections, etc., to it, at least not in the past 10 years.
It may well be that, as suggested here, the listing of a 1917 Red Sox poster is in error, but since I have no idea where the checklist originated, I can't verify that one way or the other.
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