Dennis R. Williams' superimposition of the Liberty Bell against the Moon was successful for the dollar. Ahr owned a commercial art firm and Huntington was head artist for Brown and Bigelow, a Minneapolis publishing firm. Williams, at age 21 the youngest person to design a US coin, was an art student who had originally created his design for a class assignment. No change would be made to the obverses of the coins, except for the double dating. Ahr was accused of copying his drummer from a 1973 stamp by the stamp's designer, William A. Smith; he denied it. According to numismatic historian Walter Breen, "both obviously derive from Archibald Willard's 1876 painting Spirit of '76," a painting which numismatic author David L. Ganz suggests that both undoubtedly saw sometime in their lives. Ahr, however, stated that his son had been the model for the drummer. Brooks, in a letter to Smith, stated that the design for the quarter was "sufficiently original" to impress the National Sculpture Society. Weinman later deprecated the winning designs: I really don't think what we got was a great bargain. Nothing we selected was a real winner that I'd fight to the death for. In terms of what we had to work with, though, I think we did the best we could. On April 24, 1974, the three winning designers were brought to Washington, D.C. After a tour of the White House and meetings with the congressional committees which considered the coin bills, they went to the Treasury Building and received their $5,000 checks from the new Treasury Secretary, William E. Simon, who jokingly asked them if they wanted to invest their awards in savings bonds. Mint Chief Engraver Frank Gasparro made minor changes to all three reverse designs. Gasparro simplified the quarter design, altered the drum for the sake of authenticity, changed the lettering and modified the expression on the drummer's face. He made slight changes to Independence Hall on the half dollar and altered the lettering on the dollar to facilitate the metal flow during stamping and asked the designer to straighten the bottom edge of the Liberty Bell. Ahr later stated that he would have liked more time to finalize his design, wishing to clarify the features of the drummer's face. The initials of the designer were added to the design by the Mint. All three agreed that Gasparro's changes improved their designs.