Which coin? Post a new question and include the denomination and date.
It can only be on the front, back or edge of a coin.
The letter is known as the mint-mark and tells where the coin was made. A coin having a P mint-mark (or no mint-mark on some coins) was made in Philadelphia, a coin having an S Mint-mark was minted in San Fransisco, a coin with a D mint-mark was minted in Denver.
From 1946 to 1964, the mint mark position was at the bottom left of the torch on the back of the coin. No mint mark = Phila. S = San Francisco D = Denver
The mint mark position is on the back under the words FIVE CENTS. Possibilities are:No mint mark = PhiladelphiaD = DenverS = San FranciscoThe "F" on the front of the coin is not a mint mark; it's the monogram of the coin's designer James Earle Fraser.
The mint mark is located on the reverse [tails] side of the coin at the bottom below the wreath. If there is no mint mark then the coin was minted at the Philadelphia Mint.
There is not always a mint mark on coins. If your coin does not have a mintmark it means that it was made at the Philadelphia mint in Pennsylvania.
It depends on the type of coin the date and denomination on were the mint mark is located
No US coin bears an "F" mint mark
Mintmarks identify which mint the coin was made at.
With a CC mint mark on the back, $1100 to $1600 retail. With an S mint mark, $1000 to $1100. With no mint mark, $10,000 or more - but you need to have such a coin appraised and authenticated by a professional to ensure it isn't altered or counterfeited.
There's no E mint mark. You're seeing the letter F which is the initial of the coin's designer, James Earle Fraser. The mint mark, if there is one, is on the back of the coin.
If there is a mint mark it will be a small "O" (New Orleans) below the word DIME and above the wreath on the back of the coin. If there's no mint mark the coin was struck in Philadelphia; dimes didn't carry a "P" mint mark until 1980. Please see the Related Question for more information.