1973-S Eisenhower Dollar 40% Silver Proof. In numismatics the general rule is the lower the mintage, the higher the value. In the 1970s, Ike dollars revived the traditional classic silver dollar. Only about 6% were struck in 40% silver over five years and just a portion of those in finest proof quality. With an output of just 1.0 million, this 1973-S Ike 40% silver dollar proof is the low-mintage key of the series.
1974-S Eisenhower Dollar 40% Silver Proof. Just 1.3 million were issued in this 40% silver proof quality, the second-lowest proof mintage in the Ike dollar series. 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. The Eagle on Moon reverse honoring America's space program began under Ike's administration.