If it's a silver 3c piece, $375 to $750 depending on condition.
If it's a nickel 3c piece, $17 to $60.
Go to coinfacts for pictures of each variety.
Please clarify if this a 3 cent piece or a $3 piece.
In 1866 both the silver and nickel 3 cent piece were struck. So for the silver in MS-60 $840.00 The nickel is $101.00 in MS-60
The coin is a 1866 3 cent-piece. Circulated examples have values of $12.00 to $35.00 depending on condition.
15.00 & up
15.00 & up
poor condition
No such (US) coin exists because the copper-nickel 3 cent piece was not minted until 1865.
The first 5-cent US nickel was made in 1866, the 3-cent nickel in 1865, and the copper-nickel flying eagle 1-cent in 1856.
Three-cent pieces were minted during the 19th century. If you mean 1873, please see the question "What is the value of an 1873 US 3 cent piece?"
The coin is an 1866 3 cent piece not a dime, and it's made of nickel not silver. Circulated coins are valued at $15.00-$50.00 depending on condition.
A 3 cent piece has III on reverse. It is the same size as a dime 17.9mm. An 1866 with a star on obverse will bring a nice amount of $$$ depending on condition.
Nickel 3-cent pieces were only struck from 1865 to 1889. If you instead have a silver 3-cent piece with that date, its value would be in the range of $25 to $100 depending on condition.