It was designed by Frank Gasparro. His initials appear on the presidents neck and below the eagle. The reverse is designed after the official Apollo 11 insignia. Collectors coins were struck in 40% silver while circulation coins are copper nickel. In 1971 there are two varieties. Variety one is normal and variety two was modified to show accented crater lines. In 1972 the dies were modified several times. Variety 1 is a low relief with a flattened earth and 3 islands off of Florida. Variety 2 is a high relief design with a round earth and weak or indistinct islands. The high relief reverse die was improved and that became Variety 3, which was used for the remaining two years of manufacture. In 1973 the treasury held an open contest for selection of new designs for the bicentennial dollar. Almost 1000 entries were submitted in October of 1973. It was narrowed down to 12 semi finalist and the judges chose the liberty bell superimposed on the moon for the design. The design is the work of Dennis R. Williams. The obverse was unchanged except for the dual date 1776-1976. The bicentennial dollars with the dual dates were minted during 1975 and 1976. The dual dated coins were in various offers of proof and uncirculated coins made by the Mint. They were also issued for general circulation. In early 1975 the lettering was modified to produce a more attractive design. This resulted in two varieties for that year. In 1977 and 1978 the eagle reverse was resumed. This is the variety 2 design, which is the scarce design. Graded by ANACS as MS-64, Tyoe 2 Reverse.