A combination of over-polishing of the dies and Die Deterioration... used well beyond their normal usable lifespan... you see the same thing with 1978 cents.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
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Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US
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