I may have missed it, but has there been any discussion of this article on Love of the Game's website about the "1904 Anonymous Cabinets"?
https://loveofthegameauctions.com/an...bby-discovery/
The article concludes the cards were likely issued in 1907 by the American League Publishing Company, the same company that printed a set of rare and desireable postcards in 1908. The article also includes a picture of an original ad for the cards, featuring a checklist of all cards that could be ordered -- 350 of them. The set included both current and former players. I'm not 100% sure the advertised set is in fact the same set that has been catalogued as the 1904 Anonymous Cabinets. But it sure was interesting reading, at least for me.