The bicentennial Kennedy half dollar is made of a copper-nickel alloy, special collectors coins were struck in 40% silver but they all have "S" mintmarks.
I suspect you've made an error in the question.A 1976 Eisenhower dollar is worth approximately $1.00.A 1976 Kennedy half-dollar is worth approximately $0.50.
So many were made it's still just face value.
The last Liberty Head half dollars were made in 1916. If you have a Bicentennial half with Independence Hall on the back, it's a Kennedy half.
Yes, proof versions of the Kennedy half dollar were made. These will have the S mintmark.
The 1966 Kennedy half dollar is made of 40% silver and 60% copper. It has a total weight of 11.5 grams and a diameter of 30.6 mm.
Kennedy half dollars are not made of gold'
All circulating half dollars dated 1971 and later are made of copper-nickel, using the same "sandwich" composition as dimes and quarters.
No Kennedy half-dollar from 1971 to date made for general circulation contains any silver.
The U.S. Mint has never made a "Memorial" Kennedy half dollar. Many different society's have counter stamped & gold plated Kennedy half dollars an sold them as "Memorial" coins. The coins are considered altered and have no numismatic value.
So many of the dual dated half dollars were made that only proof and special uncirculated coins sold from the mint have more than face value.
No Kennedy half dollars made for general circulation after 1969 have any silver, the 1991 is just 50 cents and is still in circulation.
Liberty half dollars were made up till 1947. Your coin is called a Kennedy half dollar and is only worth 50 cents.