I've always used 1910 as a catch-all date for them. I suppose you could try and figure out when specific photos were taken but that would only get you a no earlier than date. The Jack Johnson image is the same one used to make his side view T218 and that one has 1909 fights on the back.
There's been lots of research into the baseball T cards and I don't recall any of them being pushed back to 1908 date-wise, only 1909. Seems only logical that tha boxing cards would track the baseball cards in terms of issue dates.
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