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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I recently purchased a 2012-D Chester Arthur NGC MS65 slabbed as "95% Missing Edge Lettering" & a 2012-P Grover Cleveland (2nd Term) NGC MS66 slabbed as "Missing Edge Lettering". This follows on the heels of the find & purchase of a 2008-D James Monroe NGC MS69 slabbed as "Missing Edge Lettering" & "Annual Dollar Set"...this coin is the Satin Finish version & may be the only slabbed M.E.L. coin attributed from the Annual Dollar Set. or (208) 267-0999 to reply. All three of the above are unique at this point.