Silver JFK Half Dollar Coin Layered in Pure Gold. The most inspiring coin of the 20th century, the JFK Half Dollar was issued in 1964. The introduction of this coin marked one of the speediest actions in U.S. government history. The JFK Half Dollar (1965-1970) is composed of 40% silver and is layered in Pure Gold. A Certificate of Authenticity is included. Dimensions: 6" L x 4" W x .13" H Weight: 0.25 lbs.