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ScotI have a few of these ending on ebay today. I found four cards printed upside down on back - Zach Wheat, George Sisler, Urban Faber and Otto Miller. I also found one with the first line on back ending with the word "eighty" instead of "the". These two variations on back are the only ones I know of.
Edited to say - I don't know if there is a premium paid for these but, they are more difficult to find.