In 1971, 1972,1973,1974,and 1976 they produced 40% Silver Ikes in Blue envelopes that were considered circulation pieces there fore they would be graded MS(comon nickname Blue ikes). the were I guess maybe commerative pieces in away, not really intended for circulation and they also produced 40 % Silver Proof Ikes for those years as well the came in A similar rectangular proof like Holder in a brown Box ( common nickname brown Ikes)
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