What is where is the mint mark on a morgan silver dollar?

The mint mark on a Morgan silver dollar can be found on the reverse side of the coin, below the eagle's tail feathers. The location of the mint mark can help identify where the coin was minted. The mint marks for Morgan silver dollars indicate the following mints: "CC" for Carson City, "O" for New Orleans, "S" for San Francisco, and "D" for Denver. Some Morgan silver dollars minted in Philadelphia do not have a mint mark.