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 only 2 or 3 known including the illustrated piece below. Notice the light golden color. These seem to have been struck from business strike dies.
Aluminum J414A/P486 which appears to be unique and last appeared in the 1980 ANA.
Photo courtesy of American Numismatic Rarities.