First 45 Years of S-Mint Proof Sets 1965 2009 + a Three Coins 1976 S Silver 28 December 2023December 28, 2023adminfirstcoins, first, proof, s-mint, sets, silver, three, years 1 special 40% Silver Kennedy mint set for every year from 1965 through 1967. 1 40% Silver Kennedy Proof Sets for every year from 1968 through 1970. 1 Clad proof set for every year from 1971 through 2009.