Because prior to the 1980s, and a few exceptions (such as the "war nickels" of 1942-1945 and the Susan B Anthony dollar) since the Philadelphia mint was the main mint, it didn't use mintmarks. When the P mintmark was added to the quarter, dime, nickel and half-dollar, it simply was decided not to use the "P" mintmark on the cent.
The Denver Mint peace dollar will have a "D" mint mark located on the reverse side, near the tail feathers of the eagle. The Philadelphia Mint peace dollar will not have a mint mark, as the Philadelphia Mint did not mark its coins with mint marks during that time period.
To determine if your 1968 dime is a regular Philadelphia mint issue or a rare "No S" mint mark variety, you will need to examine the coin under magnification. Look at the area below the center of Roosevelt's neck to see if there is a visible "S" mint mark. If there is no mint mark present, it could be the valuable "No S" variety. It's recommended to consult with a professional coin dealer or grading service for a conclusive authentication.
A Philadelphia mint 1943 steel penny in circulated condition is worth approximately 10-25 cents. In uncirculated condition, it can be worth up to $5 or more. The value can vary depending on the coin's condition and any unique characteristics.
The 1991 Philadelphia mint quarter typically has a value of 25 cents as it is still in circulation and is not considered rare or collectible. If the coin is in pristine condition, it may be worth slightly more to a collector, but generally it does not have a high numismatic value.
The value of a 1921 Morgan silver dollar from the Philadelphia Mint can vary based on its condition and any unique characteristics it may have. Generally, these coins are valued for their silver content and historical significance, typically ranging from around $25 to $50 or more depending on its condition. It's recommended to have the coin assessed by a professional coin dealer or appraiser for an accurate value.
Coins made at the Philadelphia mint did not have mint marks until the 1980s. Your coin was made at the Philadelphia mint.
No mint mark coins are produced at the Philadelphia,PA
Pennies both historic and modern do not have a mintmark for coins minted at the Philadelphia mint.
Any Lincoln cent that does not have a mintmark was struck at the Philadelphia Mint
The value of a penny with no mint mark is generally one cent. These pennies are the common cents that were minted in Philadelphia. Older (i.e. pre-1950) Philadelphia cents can be worth more but it depends on their date and condition.
At the Philadelphia Mint.
Pennies are minted at three locations in the US; The San Francisco Mint, The Denver Mint and the Philadelphia Mint. Pennies from San Francisco have an "S" on them. Pennies from Denver have a "D" on them and pennies from Philadelphia have no letter.
If there is no mint mark the coin was made at the Philadelphia mint. It was not until 1979 that the "P" appeared on the penny. "P" mintmarks have NEVER been used on pennies.
Then your coin was minted at the Philadelphia mint. It isn't an error, most older coins show no mintmark if the coin was minted at the Philadelphia mint, pennies still don't show a mintmark for coins minted at the Philadelphia mint.
Their are a few answers. For pennies no mint mark means Philadelphia or for proof pennies which are only in proof sets S means San Francisco.
Please check your pocket change. You'll find lots of coins without mint marks, because the Philadelphia Mint didn't use the P mint mark on most coins until 1980. And more, pennies minted at Philadelphia still don't have a P mint mark.
U.S. coins dated before 1980 (and all pennies) that do not have a mint mark, were made in Philadelphia.