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Dan BrettaShawn, there is no stamp or impression on it. It originated from a museum in Illinois. I bought it off of ebay about a year or two back...I noticed that the same seller had another one they just recently ebayed that was slightly better condition than mine.
The Nebraska Indian spent a considerable amount of time in Illinois over the years...the cabinet is from 1902 even though the seller both times sold it as "1907". My guess is that the NI had their photo taken somewhere in Illinois and sold the photos at the games.