I believe that you will find there is a big difference in back printing on "trade cards" and CDV's. CDV's generally have little info other a photographers info as he wanted to sell more of them. Trade cards were for the merchants benefit to advertise and generally have a lot more information.
I think this card if in fact is 1 piece and not glued together has been severely cut down and could in fact be from a larger size trade card from 10-20 years after the death of Creighton. It has no resemblance of a CDV circa 1860-1870's.
Scott
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