Any standard dime dated 1965 or later and taken from circulation is worth only 10 cents. However, if by "copper" you mean that one side of the dime is copper-colored and the other is silver-colored (nickel, actually), you may have what's called a lamination error. That happens when one side of the coin's cladding (the nickel-colored part) doesn't bond properly. This is considered to be a mint error and retails for 5 or 6 dollars.
No Copper-nickel clad Copper 1 Dime "Roosevelt Dime" 1965-2017 1946-1964 Silver (.900)
A 1988 dime is worth 10 cents.
You have a Roosevelt copper-nickel clad Dime. A 1976-S coin in proof condition (PF63) is worth: $2.00.
If you have a 1940 Roosevelt dime it is fake. The Roosevelt dime was not produced by the US Mint until 1946.
It's a Roosevelt dime not a liberty dime and all are considered common, value is about $2.00
It's a Roosevelt dime not a JS dime and all are considered common, value is about $2.00.
If it has been copper plated, it's still just a dime.
No Copper-nickel clad Copper 1 Dime "Roosevelt Dime" 1965-2017 1946-1964 Silver (.900)
10 cents.
They don't exist, the first Roosevelt dime was 1946. With a date of 1940 the dime is a MERCURY dime and is common with average values of $1.00-$3.00 depending on condition.
It's a common date Roosevelt dime, just spend it.
A proof coin has a retail value of about $1.00