The 1839 Gobrecht dollar muled with the reverse of 1836, struck in copper with plain edge. This is a fantasy piece struck for a collector using die alignment III sometime in the late 1860s to mid 1870s.
The reverse, used only for restriking, has various die markers which are noted in the illustration below.
This pattern is unique and is ex Gschwend (Elder 6/08 lot G), Brand #44165, B.G. Johnson to Stacks on July 8, 1941 per Newman Numismatic Portal, Stacks 8/41 lot 1791, Judd-Illustrated History #126, Kaplan & Kosoff FPL’s late 1960’s, Simpson collection - PCGS64RB
3 examples struck in silver J108/P121 are also known.
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Photo courtesy of PCGS.