The letter "S" is used for this Mint.
San Francisco Mint was created in 1854.
No. The San Francisco mint is not open to the public.
No, The San Francisco Mint is closed to visitors, as all the space is needed for production.
It means it was made at the San Francisco mint.
Minted in San Francisco
The address of the Old Mint Building is: 88 5Th St, San Francisco, CA 94103-1810
Pennies are minted at three locations in the US; The San Francisco Mint, The Denver Mint and the Philadelphia Mint. Pennies from San Francisco have an "S" on them. Pennies from Denver have a "D" on them and pennies from Philadelphia have no letter.
The U.S. uses mnemonic mint marks so San Francisco coins carry an S mint mark.
The "S" mint mark is used by the San Francisco mint and is located just below the date on the 1941 Lincoln cent.
The S mintmark stands for San Francisco. So your coins was made at the San Francisco mint. That mint is still in operation today.
The San Francisco Mint
If your coin has a "S" mint mark on it means that it was made at the San Francisco mint in California.