Designed by Christian Gobrecht including an adaptation of the Reich-Kneass eagle reverse. Also known as a "Liberty" $2.50 or Quarter Eagle, this series had the longest run of any US type coin without major modification.
Dr. William Bigelow conceived the idea of making coins with the main designs in relief, yet sunk below the coin's surfaces. After gaining the approval of his good friend, President Roosevelt, Bigelow persuaded Bela Lyon Pratt to submit designs for a new quarter eagle and half eagle using this technique. The result is two of the most striking designs in all of American numismatics.