Proof Block Larger Than four 1982-88, plate proofs (I) with 6,320, (P) with 12,040 and (MS) with 1,101, including 759 progressives; including 1982 Washington, 1984 Ausipex, 1986 Ameripex, Flowers, Mushrooms, 1987 America's Cup, Transportation, Scouts, 1988 Sailing Week