One of 7 Gould Incorporated designs made circa 1976 as a replacement for the large Eisenhower dollar.
For additional information on modern dollar patterns, see Mike Wallace's article on modern dollar patterns by clicking here.
This design is not in Pollock. It is struck from the same obverse as on P5425 combined with a unique reverse whose most obvious feature is that the eagle has 7 tailfeathers with a long middle feather.
Examples are known as follows:
Titanium with plain edge P5428. An example was offered as lot 2065 in Bowers and Merena's 3/97 sale.
Nickel with plain edge P5429. An example was in Heritage 9/2005 sale and is illustrated above.
Photo courtesy of Heritage.