This design uses an obverse similar to the regular double eagle combined with the trade dollar reverse used on J1315-J1319/P1458-P1462.
This design was only struck in copper. Only 2 are known including one in the Connecticut State Library, ex Mitchelson and the other ex Woodin, Newcomer, Farouk, Bolender, Vickery-72 ANA now in the Harry W. Bass Jr. Research Foundation and was badly cleaned and lacquered.
Photo is a scan from the Pollock book. To view the coin in color, click here.