Here offered is 1921 – POS 3 Coin Morgan Silver Dollar with Case. The 1921 Morgan Silver Dollar was produced in three mints: Denver, Philadephia and San Francisco. The New Orleans Mint used an “O” and the San Francisco Mint an “S”. The main mint in Philadelphia did not use a mintmark. Proof examples of Morgan Dollars from all years, including 1921, are rare which makes them expensive.