Take it to a qualified professional dealer just to make sure, only 19 examples of this coin exist and were identified more than 100 years ago.
Napoleon crowned himself Emperor of the French (meaning not only France, but the French peoples throughout the world) on 2 December of 1804. He lost the title in 1814, although he briefly regained the title the following year.
Franklin Pierce was born on 23 November 1804.
Nobody flew in a successful glider in 1804.
Napoleon Bonaparte, who called himself Emperor Napoleon I, ruled France from 1804 until 1814.
Napoleon recognized the independence of HAITI in 1804.
A dollar
10.000.000$
There were no Morgan silver dollars minted in 1804. The first year of mintage for them was 1878.
Click on the link in the "RELATED LINKS" at the lower left corner of this box to see the 1804 silver dollar.
Zero
This is NOT an original 1804 silver dollar. The value is only worth what the metal is worth. If it's made out silver it will be worth more than if it just has a silver plating with some like a stainless steel core.
In your search box type in [1804 dollar] an click on images. This will bring up pictures of the coins.
Please rephrase the question
The U.S. didn't make any half dollars dated 1804.
A authentic Draped Bust 1804 dollar is worth over Two Million dollars, but all 19 known examples are well accounted for. Many counterfeits & copy's exist, also it's a favorite for modern "Silver Rounds" made to look like the 1804 dollar.
The average weight of these coins is about 27 grams for a relatively unworn specimen, but because there are multiple varieties and they were struck at different times - none actually in 1804 - weights can vary. Also remember that all "official" 1804 dollars have been accounted for long ago. Copies, replicas, and outright fakes are all over the place.
Certainly the value champion has to be the "1804" dollar. I put 1804 in quotes because these coins were really struck in 1834 using old dies to create a presentation set for the King of Siam. Auction prices have exceeded $4 million. The most physically rare dollar is an 1851-O Seated Liberty coin, of which only one specimen is known.