The term is Mint MARK, and it's in different places depending on the coin's design.
Please see the Related Question for details.
The U.S. didn't mint any silver dollars in the 1940s.
no
They stopped minting silver dollars after 1904 because the mint ran out of silver bullion. The Pittman Act of 1918 provided for the melting of 270,232,722 silver dollars and minting resumed in 1921.
It depends very much on the date. S mint silver dollars seem to be worth even just a few dollars more than silver dollars with no mintmark or a "D" mintmark.
The U.S. didn't mint any silver dollars in 1920.
The U.S. Mint did not produce a silver dollar in 1932.
They didn't mint 1920 US silver dollars.
The U.S. didn't mint any silver dollars that year.
Check that coin again. Canada didn't mint silver dollars until 1935.
The Philadelphia Mint struck 12,290,000 Morgan dollars in 1883, so yes a few were made.
The U.S. didn't mint any silver dollars in the 1940s.
The "S" Mintmark means it was made at the San Francisco Mint