When was the premier date of Body of Proof ?
This has happened at least seven times : 1968 - S , 1970 - S and 1975 - S and in the 1983 - S Prestige set , each with a dime that has no mint mark ; a small number of 1971 - S sets included a nickel without a mint mark ; 1990 - S saw both regular and Prestige sets which included a penny with no mint mark .