where is the mint mark on a 1972 silver dollar

[Walker]

Based on numismatic knowledge, as the provided context is insufficient for answering the question, the mint mark on a 1972 Eisenhower dollar can be found on the obverse, or "heads" side, of the coin. Specifically, it is located directly below the truncation of President Dwight D. Eisenhower's portrait and sits just above the year "1972."

The 1972 Eisenhower dollar was produced at three different U.S. Mint facilities, and the mint mark indicates its origin. Coins struck at the Philadelphia Mint bear no mint mark. Those produced at the Denver Mint display a "D" mint mark, and those from the San Francisco Mint feature an "S" mint mark. It is important to note that only the coins with an "S" mint mark, which were produced for collectors as uncirculated or proof specimens, contain a 40% silver composition. The circulating business strikes from Philadelphia and Denver were made from a copper-nickel clad composition and contain no silver.