If it's not proof or a very high mint state coin, it's face value
The coin is still in circulation today and has face value only
A 1972 Washington quarter is just a quarter, many are still in circulation.
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.
No, there have been many US dollar coins struck before and after 1972. However, the US Mint did make a dollar coin in 1972 (it was the second year for the Eisenhower Dollar)
Check that coin again. The U.S. has never minted a two dollar coin.