Nowhere, because all shield nickels were minted in Philadelphia.
There can't be a 1966-S nickel because the Mint didn't use any mint marks from 1965 to 1967.
Check it again. By 1980, all U.S. nickels had mint marks. That said, a 1985 nickel is worth 5 cents.
Depending on wear. Average value is $1.00-$3.00.
A 1989 nickel with a "P" mint mark is worth face value, which is 5 cents. Mint marks indicate where the coin was produced, in this case, Philadelphia. The value could increase slightly if the coin is in mint condition or part of a specialized collection.
Check under the "FIVE CENTS" on the reverse of the coin. Possible mint marks are:No mint mark = PhiladelphiaD = DenverS = San FranciscoAlso note that the coin is called either a Buffalo Nickel or Indian Head Nickel, but not "buffalo head". After all, it shows the whole buffalo, not just its head!
Your coin is called a Jefferson nickel. Liberty nickels were minted from 1883 to 1912. For information on values and mint marks please see the question "What is the value of a 1940 US nickel?"
Assuming no mint marks a mint state coin is about $30.00. Average price of circulated coins are $1.00-$12.00 depending on the grade.
Dates and mint marks really help, post a new question with that info.
Prior to 1979/80, coins struck at Philadelphia didn't carry mint marks*, so your nickel comes from that mint. Please see the Related Question for value information. (*) So-called "war nickels" bore the P mint mark from 1942 to 1945. The first coin to regularly carry a P was the 1979 SBA dollar. The next year, all other denominations except the cent were also given P mint marks.
Depends on the coin. For example a penny has it under the year. A nickel-some on the back by Monticello. lack of a mint mark in many cases just indicates it was made in Philadelphia.
6-19-11>>> Assuming no mint marks a mint state coin is about $30.00. Average price of circulated coins are $1.00-$12.00 depending on the grade.
Quarters made since 1965 are copper-nickel, not silver, and are only worth 25¢ Philadelphia quarters minted before 1980 do not have mint marks, and the use of mint marks was suspended on all coins dated 1965-67 due to the great coin shortage of the 1960s.