You have a very common error called a "filled die" error. It happens when grease or other crud gets into one of the little recesses in a coin die that forms the letters and numbers.
Unless the number is entirely missing, it's unlikely to be worth more than a small amount above face value, if that.
25 cents.
25 cents
It's a common circulation coin worth face value only.
It is worth face value unless it is uncirculated then it will be worth around 50 cents.
25¢, like nearly every quarter minted since 1965.
i would say about 8 dollars to 25 cents
Trust me, it is not authentic. The 1979 dies were destroyed 13 years before the 1993 dies were made.
If the back of your coin has a picture of an eagle landing on the moon and a very severe-looking woman on the front, it's called a Susan B. Anthony dollar. All of the ones you'll find in change are worth just a dollar. Anthony dollars were issued for circulation in 1979, 1980, and 1999 but were failures because they were almost identical in size and color to a quarter, as you noted.
No one will be able to answer that question without seeing a picture The worth is determined by the condition and the mileage and if it has any parts missing from it.
Eischied - 1979 Who Is the Missing Woman 1-8 was released on: USA: 30 November 1979
25¢, like nearly every quarter minted since 1965.
The Halloween That Almost Wasn't - 1979 TV was released on: USA: 28 October 1979