Only a dollar, I'm afraid, if the coin underneath the plating is a normal copper-nickel dollar. The gold plating is too small an amount to be worth recovering.
If the coin underneath is one of the special 40% silver dollars made for collectors the silver would be worth $4 or so at today's prices.
If the coin is a US Kennedy half dollar dated 1974 it has no silver in it and is face value.
50 cents.
The US has never made a gold half dollar.
It is only gold plated which adds no extra value. Since it is a gold plated coin it is considered altered and is worth face value.
The U.S. half dollar has never been made of gold. What you probably have is a gold-plated 1979 half-dollar. It's not really worth much above face value.
At most a few milligrams, not enough to make it worth trying to recover. Plus, the coin itself is copper-nickel so it's only worth 50 cents.
Face value only! 50 cents
It's still worth 50 cents no more than that
The only gold Bicentennial of Congress coin minted is a Five dollar coin not a half dollar, it is valued at about $300.00.
It's still worth exactly 50 cents.
Sorry the US never struck any half dollar gold coins of any date
Liberty half dollars were made up till 1947. Your coin is called a Kennedy half dollar and is only worth 50 cents.