This is the former Farouk, Kosoff, Pittman example where it was called J1797B. This pattern was struck from the regular reverse die. J1797A in earlier editions of Judd was a misdescription of this.
Photo courtesy of David Akers and Tom Mulvaney.
It is one of only 2 confirmed, the other piece is circulated and grades VF. It is illustrated below courtesy of Heritage from their August 2004 ANA sale.
For pedigree information on this and other 1916 half dollars, click here.