San Francisco has made many different types of coins since its opening. If you're referring to the fact that its primary function is now production of proof coins, please see the Related Questions.
the coin has the president on it
The mint is the place where the coin was made. In the US there are several. If the coin has a D next to the date, it was minted in Denver. S is for San Francisco.
It means that the coin was minted at the San Fransisco mint. If a penny has a D, it means the coin was minted at the Denver mint. If it has no mintmark, it was minted at the Philadelphia mint.
what happpen in san fransico in April 6 what happpen in san fransico in April 6
S means it was minted in san Francisco
Definitely no! There is not an aeroport designated san fransico; so no flight could begin from san fransico.
It means the coin was minted in San Francisco.Note that there were lots of coins in 1909, not just "the" coin.
San Francisco, California
because the San Andreas fault line lies over San Fransico
Please post a new question with the coin's date. Circulation nickels were minted in San Francisco for nearly 50 years.
Those letters are mintmarks that tell where the coin was minted. S means it was minted in the San Francisco Mint.
The 1943 Wheat Cent was made of steel.Very few of these coins are known to have been made of copper. To determine where the coin was minted it is necessary to locate the mint mark. This mark is a small letter located just below the date. If there is an "S" there the coin was minted in San Francisco. If there is a "D" the coin was minted in Denver. If there is no letter below the date the coin was minted in Philadelphia.