If it's a Sacajawea or Presidential dollar coin, it's only worth face value; feel free to spend it.
If it's a large (~40 mm) silver coin it's actually a bullion piece containing 1 oz of silver metal. Its value is determined by the current price of silver. It's not intended for spending and the $1 denomination is artificial.
The coin was made in 2007 NOT the 1700's. The date 2007 is on the edge of the coin. Also the coin is NOT gold it's brass and is only one dollar.
a dollar
value of 1845 us five dollar coin
It's a common dollar coin that's face value
There was no fifty dollar US gold coin produced in 1940.
One dollar.
Check that coin again. The U.S. has never minted a two dollar coin.
$1.00
Approximately One dollar
Check that coin again. There was no such thing as a US dollar (or the United States) in 1756.
A pewter coin is also known as a Continental dollar. Depending on the condition of the coin, the value of an original pewter dollar could be as little as 1,000 US dollars to 15,000 US dollars.
72.90