1960 - 2006 Proof Sets 1960 - 1978 Proof Sets 1979 - 1992 Proof Sets 1993 - 1999 Proof Sets 2000 - 2004 Proof Sets 2004 - 2006 1979 $12 1980 $12 1981 $12 1982 $8 1983 $9 1984 $9 1985 $8 1986 $12 1987 $9 1988 $9 1989 $9 1990 $12 1991 $15 1992 $12 1992 Silver $20