The so-called regular dies trial piece. These are believed to have been deliberately struck for sale to collectors in sets.
This was struck as follows:
J1361/P1506 with only 2 known, the illustrated ex Lohr, Renrob, southern collection, Simpson collection - PCGS665RED and the other ex Farouk, Kreisberg-Schulman 2/60, Cox-Stacks 4/62, 89 ANA, 97 ANA, Heritage 9/97 - PCGS63RB, cleaned and retoned.
There are also at least 2 known in aluminum of J1362/P1507.
Photo courtesy of Superior.