Group of 2 United States Mint Proof Sets 1968-1969 10 coins. Group of 2 United States Proof Sets 1968-1969 10 coins. Each Set contains 5 Proof Coins, the Kennedy Half, Washington Quarter, Roosevelt Dime, Jefferson Nickel, and Lincoln Cent. Each coin was struck at the San Francisco Mint and carried the “S” mint mark. The five coins were placed in a rigid plastic holder with the coins held in place by a black plastic insert. The holder was placed into a blue cardboard box. Some coins may be encountered with a cameo or deep cameo finish.