Dates "conjectural"
My write-up in the Standard Catalog gives the "date" as 1909, and concedes the issue date(s) are conjectural. This is based on the fact that the earlier version (sepia) has the undivided postcard back that was current until 1908, while the bluetone version has the post-1908 USPS-mandated divided back.
The intro adds, "It is likely one or both of these cards continued to be produced or at least available after Johnson became a major league star."
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