The U.S. Mint struck Proof Esenhower Dollars from 1971-1978. It produced some coins out of Clad and others out of 40% Silver. All Proof Eisenhoer Dollar mintages ranged from around 1 million to about 7 million. The 1972-S Proof Silver had a mintage of approximately 1.8 million which is the third lowest mintage from all the Proof Eisenhower Dollars.
Most 1972-S Proof Eisenhower Dollars came in really nice condition ranging from about PR67-69 condition. There are very few coins that are in perfect PR70 Deep Cameo condition and examples in this condition usually command a huge premium.