Portraits of Washington on medals and in other media subsequent to the sculptor's visit were most often based on Houdon's work, beginning with the 1786 "Washington Before Boston" medal engraved by Pierre Simon DuViviers. Although only one American, Abraham Lincoln, had appeared on a circulating US coin by the 1920s, the Houdon bust had been used as the basis of the portrait of Washington on the commemorative Lafayette dollar dated 1900 and on the Sesquicentennial half dollar of 1926. According to coin dealer and numismatic historian Q. David Bowers, the Houdon bust, even then, was the most common representation of Washington on coins and medals. Little is known of Flanagan's creative process, although models of Flanagan's quarter with a different portrayal of Washington, facing right, and with a different eagle, have come on the market. Flanagan's adaptation differs from the Houdon bust in some particulars: for example, the shape of the head is different, and there is a roll of hair on the quarter not found on the bust.