
Based on general numismatic knowledge, as the provided search results do not contain this specific information, the mint mark on a 1921 Silver Dollar is located on the reverse side of the coin. You can find it centered below the eagle's tail feathers and just above the letters "D" and "O" in the word "DOLLAR".
For the year 1921, Morgan Dollars were produced at three different U.S. Mint facilities. A coin with a "D" mint mark was struck in Denver, and a coin with an "S" mint mark was produced in San Francisco.
It is important to note that if your 1921 Morgan Silver Dollar has no mint mark in that location, it was minted in Philadelphia. The Philadelphia Mint did not use a mint mark on Morgan Dollars during that period. Therefore, the absence of a mint mark is an indicator of its origin.


