In 1975 and 1976, the United States Mint honored the nation?s 200th birthday with special bicentennial Eisenhower dollars featuring a dual-dated 1776-1976 feature on the obverse and a special reverse design showing the Liberty Bell superimposed on the moon. There are two basic varieties known among 1776-1976 copper-nickel clad proofs. These include the Variety I featuring a bold, san-serif font on the reverse inscriptions and the Variety II, which features finer inscriptions with serifs. All 40% silver proof are Variety I specimens.
Following the Bicentennial program, the coin?s regular reverse design featuring the Apollo 11 insignia returned in 1977, though the 40% silver proofs did not. While proof Eisenhower dollars are extremely common, pre-Bicentennial deep cameo proofs are not and generally sell for multiples of standard proof Ike dollars.