In honor of the 50th Anniversary of the Kennedy Half dollar's initial minting, the U.S. Mint released the special 4-coin silver Kennedy half-dollar sets.
Each set includes the following coins:
One reverse proof coin from the U.S. Mint at West Point
One proof coin from the U.S. Mint at Philadelphia
One enhanced uncirculated coin from the U.S. Mint at San Francisco. This is a special wire brushing technique implemented in Philadelphia for the first time. The obverse in the areas of the effigy (portrait), lettering, and border will all receive a heavy laser frosting treatment. On the reverse, the lettering and border will each receive a heavy laser frosting treatment. Other elements of the eagle will receive a standard (moderate) laser frosting treatment to enhance certain artistic detail. The stars will receive a laser polish technique to accentuate them against the field.
One uncirculated coin from the U.S. Mint at Denver