President John Fitzgerald Kennedy was assassinated in November, 1963, so the U.S. Mint began producing the Kennedy Half Dollar in his honor in 1964. Coincidentally, 1964 was also the last year that circulating US coinage contained 90% silver, so 1964 Silver Kennedy Half Dollars are the only year those coins were made of 90% silver. Starting in 1965, dimes and quarters were made entirely of copper and nickel, containing no silver at all, but Kennedy Half Dollars continued to be produced with a silver content that was reduced from 90% 40% from 1965 through 1970. It’s worth noting that the 1970 Kennedy Half Dollars were not released into circulation and were only available as part of Proof Sets or Mint Sets that could be ordered directly from the U.S. Mint. Because of this, although they are also made of 40% silver, 1970-dated Kennedy Half Dollars are a little more valuable than their 1965-1969 counterparts, so they are not generally sold with the more common 1965-1969 coins. Starting in 1971, the Kennedy Half Dollar was made of copper and nickel and contained no silver at all. This product is shipped as $1 in face value (two 40% silver Kennedy Half Dollars). Coins will be dated between 1965 and 1969 and will be in average circulated condition or better.