The thing about dating the picture is that it doesn't really help us to date when the poster was issued, except to define the early end of the possible time frame.
The Ruth Red Sox batting poster was released in 1921, 1925 & 1927; but the picture was taken in spring training 1918.
I suppose what I was hoping was that somebody would say "there is mention of the poster in the (month / year) issue of the magazine".
I have not been able to find any mention, but I do not have every issue.
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