1866 was the first year for shield nickel's, the only US coins dated 1804 are a Half Cent,Large Cent,Quarter,Dime and a Dollar.
If it's a fake, it's worth little to nothing.
A US half dollar with a date of 1979 is a Kennedy half dollar not a liberty half dollar. The coin has no silver and is only face value.
It has a metal value of about $10.
Value is for the silver about $2.50
The US didn't mint any silver dollars for circulation from 1804 to 1835 inclusive.
a half dollar
No US dollar coins were minted for circulation from 1804 to 1835. Look at the coin again and post new question.
A U.S. half dollar dated 1953 or 1952 is a Franklin half dollar. If it shows any wear, the value is only for the silver, about $10.00. The coins are very common.