US 1 Dollar
This coin is common with values of $15.00-$25.00 in average condition
The coin is a common Sacagawea dollar coin and its worth a dollar.
If the coin does have a mintmark it would be under the "DO" in dollar on the back of the coin.
If the coin has a Mintmark it is on the back of the coin, above the letters DO in dollar.
If the coin has a Mintmark it is on the back of the coin, above the letters DO in dollar. If no mintmark the coin was minted in Philadelphia.
Look at the back of the coin for "HALF DOLLAR" no US dollar coins were struck after 1935.
No U.S. one dollar coin is called a "Liberty" dollar. By the date 1979 your coin is a Susan B. Anthony dollar. The 1979 Wide Rim (near date) variety was only produced at the Philadelphia Mint so a "S" mintmark coin can't be a wide rim coin. Unless the coin is a high grade Mint State example it's just face value.
The back of Presidential dollars have the Statue of Liberty on the back.
One dollar.
That depends on which dollar coin you mean, 4 different series are in circulation today.
That's a Susan B. Anthony dollar coin, and it's worth one dollar.
That is a Sacagawea dollar, they have been minted from 2000 onwards and are worth one dollar.