Large lot of U.S.A proof mint sets includes 4 1968 sets, 7 1969 sets, a 1987 set, 7 1970 sets, 8 1971 sets, 5 1972 sets, 3 1973 sets, 5 1974 sets, 8 1975 sets, 7 1976 sets, 7 1977 sets, 4 1978 sets, a 1979 set, 4 1980 sets, 7 1981 sets, a 1983 set, 4 1984 sets, 3 1985 sets, 2 1986 sets, a 1987 set, 2 1988 sets, 2 1989 sets, 2 1990 sets, 3 1991 sets, 9 1992 sets, 4 1993 sets, 9 1994 sets, 2 1995 sets, 4 1996 sets, 4 1997 sets and 2 1998 sets. There are also 18 in plastic cases, mostly Ikes and JFK.