
The provided context offers limited direct information, pointing only to the existence of a 1921 Dollar from the Philadelphia mint. A complete numismatic explanation requires supplementing this information.
To locate the mint mark on a 1921 silver dollar, you must first identify which of the two designs was produced that year: the Morgan Dollar or the Peace Dollar. The location is specific to the design and is always found on the reverse (tail) side of the coin.
For the 1921 Morgan Silver Dollar, the mint mark is situated below the eagle's tail feathers, centered just above the letters "D" and "O" in the word "DOLLAR." In 1921, these coins were produced at three U.S. Mint facilities. A small "S" indicates the coin was struck in San Francisco, while a "D" indicates it was struck in Denver. If there is no mint mark present in this location, the coin was produced at the Philadelphia Mint, which was the standard practice for that facility's coinage at the time.
For the less common 1921 Peace Dollar, the mint mark is also on the reverse side. It can be found on the lower part of the coin, to the left of the eagle, just above the edge of its tail feathers. As with the Morgan Dollar, an "S" or "D" will be present for the San Francisco or Denver mints, respectively, while a coin from the Philadelphia mint will have no mint mark.


