Group of 2 United States Mint Proof Sets 1981-1982 12 coins. Group of 2 United States Proof Sets 1981-1982 12 coins. All coins were minted at the San Francisco mint and carried the “S” mint mark. The proof coins are commonly found with attractive black and white deep cameo finishes. Each Set contains 5 coins Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, Kennedy Half Dollar. The 1981 set have 6 coins due to the inclusion of the Susan B. Anthony dollar. These 1981 set had not been check for type 2 Susan B. Anthony dollar, where type 1 trend ms69 $20 and type 2 trend ms69 $160. Each proof coin was fit into a slot within a red plastic insert, which was sealed in a rigid clear plastic holder. An outer black plastic piece served to protect or display the set. The outer cardboard box was black and open at the top.