No. In fact, huge numbers of older US Coins don't have mint marks. For almost 180 years the Philadelphia mint didn't put a mint mark on any coins struck there. The only exceptions were the "war nickels" made from 1942 to 1945.
Starting in 1979, a "P" mint mark was added to $1 coins, and the next year it appeared on all other denominations except the cent. Cents minted at Philadelphia still don't have mint marks.
US coins minted before 1979-1981 (the exact date varies with the coin) don't necessarily have a mint mark. Coins without a mint mark were minted at the US Mint facility in Philadelphia. Since 1981, all coins except for the US cent will have a mint mark; for Philadelphia it will be a "P". US cents, often misnamed "pennies," minted in Philadelphia still do not carry a mint mark even through 2007.
US Coins with no mint mark were minted at the US Mint's main facility in Philadelphia, Pennsylvania.
The Mint Mark on a US coin is the letter that indicates which mint struck the coin. You'll find the mint mark just under the date:Philadelphia (no mint mark)Denver (D)San Francisco (S)Mint mark are present on many coins, not just wheat cents. In fact, since 1980, all US coins except cents made in Philadelphia carry mint marks. "P" designates other coins made in that city, and "W" is used on special collectors' coins made at West Point.
In 1964, the US mint was making coins primarily at two sites, Philadelphia and Denver. To distinguish the coins, the Denver coins had a D under the date. The Philadelphia coins had no mint mark.
All 1979 US $1 coins (Susan B. Anthony dollars) carry a mint mark next to the neckline of her portrait. 1979 dollars were the first coins since the famous "war nickels" to carry a P mint mark for Philadelphia; the next year all other Philadelphia coins except cents also started using mint marks.
The mint mark "S" on US coins means the coin was minted in San Francisco, California. For more information concerning mint marks visit the site at the related link, below. Coins produced at the Denver mint have a "D" and those at the Philadelphia mint have either no mint mark (for pennies and coins before 1980) or a "P" for all other denominations. Coins produced at the mint at West Point, NY (largely bullion coins, although some 1996 dimes were produced there) have a "W" mint mark.
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.
No. Remember that Philadelphia didn't use a P mint mark on $1 coins until 1979, so anything struck in Philly before that will have a blank mint mark position. These coins are normally just called "Peace dollars" because ALL $1 coins up till that time had a picture of Miss Liberty on them, and to this day all US coins carry the word LIBERTY.
The letter "D" is the mint mark for the US Mint in Denver, Colorado.
For most US coins, it means the coin was minted at Philadelphia before 1980, when the P mint mark was adopted. Cents minted at Philadelphia and West Point don't have mint marks, and all coins dated 1965 through 1967 don't have mint marks regardless of where they were produced.
Philadelphia (no mint mark) : 1,963,630,000Denver ("D" mint mark) : 2,407,200,000San Francisco ("S" mint mark, only proof coins) : 594,000 sets sold; total mintage of cents unavailable from the US Mint
I'm assuming you mean the mint-mark? The mint-mark shows which branch of the US mint created the coins, if there is a P mark (or no mintmark on some coins) the coin was minted in Philadelphia, a D mark signifies Denver, an S mark shows the coin was from San Fransisco and a W mark is from the West Point Mint.