Normally you have to know a coin's denomination to locate the mint mark because it can be in different places. Also, Philadelphia did not use a mint mark on most coins until 1980 so it's very possible your coin doesn't have a mint mark.
Once you know the denomination you can check a site such as www.coinfacts.com that shows the mint mark locations for all US coins.
Not enough information. Please post a new question with the coin's denomination.
On an 1879 Silver Dollar, the mint mark is located on the reverse side, just below the eagle's tail feathers. Depending on the mint where it was produced, the mint mark will be either an "S" for San Francisco, "CC" for Carson City, or no mint mark for the Philadelphia mint. This small letter indicates the location where the coin was minted.
It depends on the type of coin the date and denomination on were the mint mark is located
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.
If the coin has a mintmark, it's on the reverse above the letters DO in dollar.
The 1879 Morgan dollar with no mint mark is common. A circulated coin is worth $32.00-$39.00. Average Mint State coins are $42.00 to $55.00
The 1879 Morgan dollar with no mint mark is common. A circulated coin is worth $32.00-$39.00. Average Mint State coins are $42.00 to $55.00
$27 to $120,000 depending upon the mint mark and the condition of the coin.
The lack of a mint mark usually indicates that the coin was minted in Philadelphia.
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.
It can only be on the front, back or edge of a coin.
A mint mark tells where the coin was minted, for example, a P mint mark (or in some cases no mint mark) signifies the coin was minted in Philadelphia, D is for Denver, S is for San Fransisco. I'm assuming someone told you that the mint mark was under the eagle for whatever coin you had, so you simply need to look under the eagle to find a mint mark. Keep in mind that some coins were produced in the Philadelphia mint and have no mint mark.