Look at the coin again and post new question. No U.S. one dollar coins were struck in 1964.
It's a half dollar not a dollar. The coin is very common, most are only valued for the silver, about $12.00
Please look at the back of the coin. It must be a half dollar as shown by its denomination, because no circulating $1 coins were made in 1964. There's more information at the Related Question.
What you presumably have is a James Buchanan presidential dollar coin. It was minted in 2010 and is worth one dollar.
It is a common coin and only worth its silver content, which is about $12 at the time of writing.
The bicentennial dollar coin is still worth one dollar.
The bicentennial dollar coin is still worth one dollar.
Eisenhower was on the DOLLAR coin in the 1970s. KENNEDY has been on the half dollar since 1964. A 1985 Kennedy half is still worth 50 cents.
The name is Sacagawea, and the coin is worth one dollar.
The Andrew Johnson dollar coin is worth exactly one dollar.
A Sacagawea dollar coin from circulation is only a dollar.
The coin is only 40% silver and has a value of $2.73 only the 1964 Kennedy half dollar was 90% silver.
One dollar.