
Based on the provided context and general numismatic knowledge, the mint mark on an Eisenhower dollar is located on the obverse, or "heads," side of the coin. You can find it directly below the portrait of President Dwight D. Eisenhower's neck and just above the date.
The letter of the mint mark indicates where the coin was produced. A "D" signifies the Denver Mint, and an "S" signifies the San Francisco Mint. If your Eisenhower dollar does not have a mint mark in that location, it was struck at the Philadelphia Mint, which was standard practice for that facility during the period these coins were made.
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