Williams, was replaced in 1977 with the coin?s regular reverse visage ? the Apollo 11 insignia. In 19, all Eisenhower dollars honored the nation?s bicentennial with a 1776-1976 dual date on the obverse and a special reverse design with the Liberty Bell superimposed on the surface of the moon. While most Eisenhower dollars are made from copper-nickel clad, many uncirculated pieces were minted in a 40% silver format at the San Francisco Mint and bear an ?S? mintmark. The Eisenhower dollar symbolizes at least two numismatically significant elements, being the first dollar coin minted during the copper-nickel clad era (which began in 1965) and the last regularly issued dollar coin with physical dimensions approximating the traditional silver dollars of earlier times. Eisenhower dollars were minted from 1971 through 1978 and designed by Frank Gasparro.
