This is one of seven patterns produced in 1909. This used to be J1781 in earlier editions.
This one appears to be based on the 1896 design used on J1770-J1772/P1986-P1989 but with differences in star arrangement and the move of motto "E Pluribus Unum" to the reverse.
It is unique with the only example known in the Smithsonian.
Photo courtesy of the National Numismatic Collection of the Smithsonian Institution.