It's, well, a small letter S located somewhere on a coin that was minted in San Francisco.
It can appear in various places depending on the coin's date and denomination. On coins minted since 1968 (mostly proofs for collectors, but some cents and nickels) it's near the date. On older coins it's usually on the back side, but you have to check a guidebook or site like Coinfacts.com to know exactly where it's hidden in the design.
It can only be an O or S and is on the reverse of the coin.
It's a D or S on the back of the coin between the tip of the tail an the word one.
A mint mark will be a letter "C", "D", "CC", "O", "P", "S" or "W", usually smaller than the other letters of a coin. They are located in different places on different coins.
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.
1879 would make it a Morgan dollar, so the mint mark is located on the reverse (tails) side, near the bottom, just above the letters "do" in the word "dollar." No mint mark means it's from Philadelphia, S is for San Francisco, O is New Orleans, and CC is Carson City.
It can only be an O or S and is on the reverse of the coin.
The mint mark position on all Mercury dimes is to the right of the E in the word ONE on the reverse of the coin. No mint mark = Philadelphia D = Denver S = San Francisco
You look at the mint mark. If it is a D, then it is Denver, if it is a S, then it is San Fransisco, if it is a P, it is a Philadelphia.US Coins carry a mark to identify the mint.
It's a D or S on the back of the coin between the tip of the tail an the word one.
A mint mark will be a letter "C", "D", "CC", "O", "P", "S" or "W", usually smaller than the other letters of a coin. They are located in different places on different coins.
$20 if very worn $30 if moderately worn $60 if like new, with no mint mark or an "S" $90 if like new with a "CC" mint mark
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.
Uh, a small "S" ! San Francisco struck circulating coins up to 1955 and then again sporadically from 1968 to 1975. Since 1968 all proof coins except 1999 dollars have been made there and carry an "S" mint mark.
For this year the mintmarks can only be "S" "O" and "CC" or no mintmarks. No Morgan dollar will have a "P" mintmark like modern coins.
Look to the left and slightly above Miss Liberty's feet to see if there is a small S or D on the pedestal. That's the mint mark, and its presence affects the coin's value. (The M on the other pedestal is the designer's monogram.) Worn condition - $5 with no mint mark or an S, $7 with a D Moderate wear - $7 with no mint mark, $10 with an S, $17 with a D Slight wear - $12 with no mint mark, $22 with an S, $35 with a D
If you know it's a 1921 "S" Morgan you found the mint mark
1879 would make it a Morgan dollar, so the mint mark is located on the reverse (tails) side, near the bottom, just above the letters "do" in the word "dollar." No mint mark means it's from Philadelphia, S is for San Francisco, O is New Orleans, and CC is Carson City.