This could be a key card towards your research Steve, crop mark in the top right corner, plus the plate scratch. You now know where one card definitely was on the sheet
It also has a wet sheet transfer, which I noticed on at least one other scan posted too
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Check out my two newest books. One covers the life and baseball career of Dots Miller, who was mentored by Honus Wagner as a rookie for the 1909 Pirates, then became a mentor for a young Rogers Hornsby.
https://www.amazon.com/dp/B0CV633PNT The other has 13 short stories of players who were with the Pittsburgh Pirates during the regular season, but never played in a game for the team
https://www.amazon.com/dp/B0CY574YNS