The US didn't issue $1 coins in 1789 so you most likely have a modern Presidential Dollar. The dates on the front are the years that George Washington served as president. The minting date (2007) is on the coin's edge.
If that fits the coin you have, it's made of brass rather than gold and is only worth face value - $1.
The first US Dollar coin was struck in 1794
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.
The first US Dollar coin was struck in 1794
a dollar
value of 1845 us five dollar coin
A "dollar" made in 1221 doesn't exist, so there is no value. The dollar is US currency and the US was not established until 1789. Money in 1221 was different than it is today and not made of silver. Each coin was hand casted and made in 1221.
It's a common dollar coin that's face value
One dollar.
There was no fifty dollar US gold coin produced in 1940.
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.
72.90