28 U.S MINT PROOF COIN SETS. Including two each 1981, 1982, 1983; four 1985; three 1986; two each 1991, 1992, and 1993; four 1994; two each 1995, 1996, 1997, and 1998; two each 1999, 2000,and 2002 with quarters; two 2003 , and two 2004 with one set extra quarters. Estimate $150-250