One of 7 Gould Incorporated designs made circa 1978 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.
According to Roger Burdette in his book "Private Pattern and Related Pieces International Nickel & Gould Incorporated", these were struck on planchets that started with grooved edges and when struck were placed in a plain edge collar. Some coins still show the grooves but the intent was for these to have plain edges.
Examples are known as follows:
Titanium (powdered metal) P5430 / RB1005 with at least 3 known including an example in the Smithsonian.
Nickel P5431 / RB1000 which is possibly unique and ex Heritage 11/21, Saul Teichman - NGC Unc details with a test cut on the edge
This is a composite of images taken from the Bowers and Merena 8/2005 sale.