A "D" means that the penny was minted in Denver An "S" means that the penny was minted in San Francisco (note - only proof cents are now minted there) A penny without a mint mark was minted in Philadelphia
P (or no letter): minted in Philadelphia, Pennsylvania D: minted in Denver, Colorado S: minted in San Fransisco, California
This means that the coin was minted in Philadelphia. If it had a "D" mintmark, it would be minted in Denver and an "S" means San Francisco. It is quite common for early coins minted in Philadelphia to not have a mint mark on them.
On the back of the coin under the "O" in "ONE" there should either be no mark, a D or an S. If your coin has no mark, it was minted in Philadelphia. If it has a D it was made in Denver and if it has an S it was made in San Fransisco.
All the Washington Quarters minted in the year 1989 carried a mint mark: "P," "S," or "D." The P and D minted coins are worth in MS60 condition: 75 cents; the S coin was minted only in proof and its value is: $3.00.
No D or S indicates that it was minted in Philadelphia. It's worth 25 cents.
It means that the coin was minted at the San Fransisco mint. If a penny has a D, it means the coin was minted at the Denver mint. If it has no mintmark, it was minted at the Philadelphia mint.
Errors that can be found on a wheat penny are doubled-die obverse, S over D, D over S and for 1922 pennies no D or a weak D. In 1922 pennies were only minted in Denver all other years they were minted in Philly(no mint mark) and Denver (D) along with San Fran(S) in select years.
Look on the reverse of the coin. If there is a small "D" or "S" under the word "ONE" then it was minted in Denver or San Francisco. If there is no letter below"ONE" it was minted in Philadelphia.
If you mean a US Cent, there is a 'D' below the date if it was minted in Denver, Colorado, an 'S' if it was minted in San Francisco, California. If neither of these mintmarks is there, it is from Philladelphia, Pennsylvania.
The mint is the place where the coin was made. In the US there are several. If the coin has a D next to the date, it was minted in Denver. S is for San Francisco.
No mint mark indicates that the coin was minted in Philadelphia.