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Anonymousalso has them listed as 1904 (American League) and 1906 (National League), so this would need to be changed as well.
Does anyone know how these cards were issued? I mean, they were part of a game - was it like a board game where the red back set and the blue back set all came in one package as part of the game? If so, were there 2 different games, one more common than the others? Has a complete set, original game ever been offered by auction that would give more info on when they came out and how they were originally distributed?