1972-S Eisenhower 40% Silver Dollar. Eisenhower dollar proofs were the first silver dollar proofs issued to the general public by the U.S. Mint (the few made earlier are rare and extremely costly). It revived the traditional-size silver dollar which had been suspended after the final 1935 Peace silver dollar. In 1972 just 1.8 were issued in this 40% silver proof quality. Overall, only 6% of Eisenhower dollars were struck in silver and less than half of those in this finest-quality proof form, with deep-struck engravings and dazzling mirror surfaces.
1976-S Eisenhower Bicentennial 40% Silver Dollar. For the Bicentennial of the Declaration of Independence, Congress authorized a special Liberty Bell/Moon reverse engraving, suggesting 200 years of American progress. The Bicentennial coins (quarters and half dollars also) are the only ones double-dated in U.S. Mint history. The superb proof minting features deep-etched frosted engravings that contrast with dazzling mirror-finish backgrounds. Far fewer of the 40% silver proofs were struck than silver Brilliant Uncirculated issues.