From 1971 to 1978, the U.S. Mint issued dollar coins with the obverse depicting President Dwight David Eisenhower and the reverse the insignia of the Apollo 11 Moon landing, both designed by Chief Engraver Frank Gasparro. The 1976 Bicentennial commemorative design, produced in 1975 and 1976, featured the Liberty Bell and the Moon on the reverse (designed by Dennis R. Williams), while retaining the Eisenhower obverse, and the dual dates 1776–1976. The Eisenhower dollars minted for general circulation contained no silver or gold, but were instead composed of the same copper-nickel clad composition used for the dime, quarter, and half dollar. This made the circulation coins extremely resistant to wear and, like the smaller denominations, they still retain a good deal of shine even when subject to mass usage.