The 1865 regular dies trial piece. These are believed to have been deliberately struck for sale to collectors.
Examples were struck as follows:
Copper J413/P484 with over a dozen known. According to Brian Koller, 2 obverse dies were used, one the same obverse die as the regular issue proofs and exhibit prominent repunching and the second and considerably rarer obverse die exists with a high date and no evidence of date repunching.
Oroide J414/P485 with at least 4 examples known per Michael Bourne including the illustrated piece below. Notice the light golden color. These seem to have been struck from business strike dies. Testing is recommended on these to see if they are truly oroide.
Aluminum J414A/P486 which appears to be unique with only the Winthrop-B/R 9/75, Heritage 8/80 ANA, Simpson-Heritage 1/21 - PCGS66 example known.
Photo courtesy of American Numismatic Rarities.