I do not think that the Sporting Life Postcards were issued until 1907. It was customary for the Sporting Life to picture the previous year's team on their issues. They did the same with their oversized supplements as well. Here is an advertisement for their postcard set. It is from their May 18, 1907 newspaper and is the first mention of their postcard set that I can find. The wording "just issued" certainly indicates that the set was released right around the date of their publication.
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