Error coin specialist Fred Weinberg confirms ‘plain edge’ 2014 Coolidge Presidential dollar of Denver Mint

PCGS authenticates first known example lacking edge inscriptions
By , Coin World
Published : 06/06/14
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The edge inscriptions are applied after the coins are struck, in a separate production step. The edge inscription equipment was not integrated into the otherwise seamless production line at the Mint facilities until 2009. The separation of the edge inscription equipment in 2007 and 2008 helps account for the larger numbers of coins with plain edges from those two years.

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