The regular dies trial piece struck in copper. These are believed to be true die trials, ie, struck to test the dies and not collectors coins as was the case for most off-metal patterns struck in the 1860s through the 1880s.
The only example known, struck from Overton-117 dies was cut down and used as a half cent planchet - 1795 Breen 6, Cohen 6 per Pollock. It is ex Ruby-Superior 2/74, Superior 10/77, Davy collection per Breen.
Photo courtesy of Superior.