It is necessary to know the amount of wear and mint mark (if it has one) to be able to make an estimate of value. I would suggest you take your coin to a reliable dealer and have it appraised.
It's worth one dollar.
what is a 1979 old 20 dollar bill worth
It's still worth one dollar.
In 1979, that was Susan B. Anthony. It's worth one dollar.
They're worth one dollar each.
It's still worth one dollar.
They both contain no silver and are not rare. They are both only worth a dollar unless they have the mintmark "S".
It's still worth one dollar.
A 1979 US dollar coin is still worth one dollar.
One dollar.
The 1979 SBA dollar coin is still in circulation today, value is one dollar.
1979 was the first year of the Susan B. Anthony dollar. Hundreds of millions were minted, and it's worth exactly one dollar.