It's worth one dollar.
The 1979-D Susan B. Anthony dollar is still in circulation today, the coin is face value.
The coin is still in circulation and only face value.
The coin you are referring to is likely the Susan B. Anthony dollar coin, which features a depiction of the suffragist Susan B. Anthony on the obverse and an eagle landing on the moon on the reverse. These coins were minted from 1979 to 1981 and then again in 1999. In circulated condition, the value of a 1979 Susan B. Anthony dollar coin is typically around face value ($1), as they are still fairly common.
This coin is often called a Susan B. Anthony dollar because it depicts that 19th-century advocate for womens' rights. Please see the question "What is the value of a 1979 Susan B. Anthony Dollar?"
Susan B Anthony
in 1979
A 1979 Susan B. Anthony coin is worth 1 dollar (face value) still to this day unless in a condition that is UNC.
1979
1979
$1 to $7500 depending upon the mint mark, the variety and the condition of the coin.
The coin is not a silver liberty dollar. It's a 1979 Susan B. Anthony Dollar coin and has no silver in it and the value is one dollar.
No such coin exists, all 1978 dollars are Eisenhower dollars. Susan B Anthony dollars would not be minted until 1979.