[darwinbulldog]

Thank you to Mike Frohme for sending these through the mail and allowing me to examine them in hand. Here, from that examination, is my assessment.
It appears to me that the cards are essentially rebacked (or extra-backed really). My guess is there was just one collector who glued a bunch of his cards onto some movie tickets, in 1925 presumably. Then someone cut them down to the length and width of the baseball cards, possibly many years later (or maybe the same day, who knows?). In any case I see two distinct card stock textures and shades between the baseball front and the theatre back and would guess that one would see just the regular E/W back on there if the ticket could be safely removed. The separate cardstock is most noticeable where the baseball card is heavily creased to the point of tearing. The theatre ticket stock, it is worth noting, is in solid condition and suggests that the baseball cards were already in rough shape when they were adhered to the tickets. I do not regard this as a back variation that should be cataloged but more a curiosity as a window onto something an old collector did with his cards once upon a time.