When Congress authorized the Franklin half dollar series in 1948, it was expected to be issued for at least 25 consecutive years. But in 1964 fate intervened, and following the tragic loss of President Kennedy, Congress quickly approved a new 1964 Kennedy half dollar. The Franklin half dollar was America's last half dollar to be completely struck in traditional 90% silver. Our set features the 90% silver 1961-1963 three final dates in finest-quality proof form. These coins were only issued as part of complete proof sets and can be tough to find separately.