Posted 07/01/2012 10:35 pm
The "Blue" and "Brown" Ike's were minted in 1971, 1972, 1973 & 1974. The "Blue" Ikes are the Business Strike and the "Brown" Ikes are the Proof strikes. Both bear the S mint mark.
The 1976 Bicentennial Issues also came in commemorative 3 coin packaging. The Business strikes came in a red envelope and the Proof strikes were distributed in a little nicer looking blue "folder".
Not exactly sure what you have.
