It isn't an error, on most coins, the Philadelphia Mint didn't get a mintmark until 1980. So your coins were simply minted at the Philadelphia mint and not an error.
$25
All error coins need to be seen. Take it to a coin dealer for an idea of value.
Value depends on what kind of error. please be more specific
CoinTrackers has estimated the 1974 D Washington Quarter value at an average of 25 cents
It depends on what the error is, please post a new question with more details
Not enough information. Please post a new question with a description of the suspected error. Thanks!
This is a rare misstruck error and is worth up to $90.00 according to condition.
$.25 unless it was an error. 2004 Florida quarters are not rare.
Check that coin again. Mint marks were on all quarters by 1981.
The double die error on the Wyoming quarter is so minute that it is very difficult to see without the aid of a magnifing glass. Errors that have a high value are usually those that are easily seen by the eye. Those like the Wyoming quarter are of interest to error collectors but the public usually has little interest in an error on a coin they can't look at and see it. Since it is the demand for the coin that sets its value, this difficult to see error will probably not have a very high value.
Coins with errors need to be seen for a evaluation, the type and condition of the error determines value. A dealer or collector can do this.
Coins with errors need to be seen for a evaluation, the type and condition of the error determines value. A dealer or collector can do this.