This is a test lid from 1975 or 1976 by Michael Schechter and Associates. It uses the Linnett drawings which came out in 1976 and pre dates the numerous disc sets MSA would put out over the next couple of years. Mike Mosier of Columbia City Collectibles dated it at 1975 and there aren't many people more knowledgeable about odd ball stuff than them, so I am putting it in the 1975 file. I have never seen another one.
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