Nice Smith, Brian! Didn't know that variation existed.
Another in the "total population less than Wags". Haven't seen more than 20 or so with this back. They're on the edge of "carddom" as they're like other theatre cards, but these are on thicker stock, and may have been licensed/re-used later as advertising as they have a 12/31/1925 expiration date.
All the ones I've seen are Series "D", but that sort of implies at least three other series exist ... whether or not they're baseball is a separate issue.
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Mike