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Although described as regular dies trial pieces, this was more likely deliberately struck for sale to collectors as part of complete copper sets.
T. Harrison Garrett had one and a double set was apparently stolen from the Iowa State Historical Museum.
About a half dozen are known.
Photo courtesy of Superior, this is the Garrett coin.
These were also struck in Brass J593/P657 with supposedly only 5 struck including the piece illustrated below. We believe that there may be a couple more than that in actuality.

Photo courtesy of American Numismatic Rarities.
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