Jeff, I'm glad you brought up the Exhibit issues, I've been meaning to bring up the following....
I have shown this variation before and it is yet to be catalogued anywhere. One of the cards is likely a part of the 1923 or 1924 sets and (for some reason) they thought to re-crop the O'Neil photo. I haven't really paid attention to whether one is tougher than the other (but I suspect one is--and from a later years (1923 or 1924) set).
-Rhett