The value would depend on the condition and date of the coin.
prices vary from $1 to $145,000 depending on condition, mint mark, and date.
From $1 to $20,000 depending upon the mint mark and the condition of the coin.
F is not a mint mark. It's the initial of the coin's designer, James E. Fraser. The mint mark position is on the back under FIVE CENTS. Please see the question "What is the value of a 1929 US nickel?" for more information
What you're seeing isn't an E and isn't a mint mark. It's an "F" which is the initial of the coin's designer James Earle Fraser. The mint mark, if there is one, would be on the back under the words FIVE CENTS. (FWIW, the US has never used an E mint mark) Please see the question "What is the value of a 1937 US nickel?" for more information.
Please post a new question with the coin's date. If you know where the mint mark is located include the coin's mint mark as well.
"F" is designer's initial (James Fraser) rather than a mint mark. The mint mark, if there is one, would be located on the back under the words FIVE CENTS. Please see the question "What is the value of a 1936 US nickel?" for more information
A 1989 U.S. nickel is worth five cents. However there is no "C" mint mark on any current US coin - only P or D.
The F is not a mint mark. It's the initial of the coin's designer, James E. Fraser. The mint mark, if any, is on the back under the words FIVE CENTS.
The letter is an F rather than E but it's not a mint mark. It's the initial of the coin's designer, James E. Fraser. Mint marks were on the backs of nickels until 1964. The mint mark, if any, is under the words FIVE CENTS. Please see the question "What is the value of a 1935 US nickel?" for more information.
On the back, to the right of the base of the building. No mint mark = Philadelphia D = Denver S = San Francisco
Without seeing the mark it is difficult to give an estimated value. The mint did not intentionally make a nickel with a mark above the head but sometimes damage to the dies will create a mark. I would suggest you take it to a coin dealer who can actually see what you have and perhaps can give you more information about it.
The P mint mark didn't appear on circulating US coins until 1979/1980 so your set isn't a mint error. As of 07/2015 a complete 1969 mint set retails for about $8.