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<p>[QUOTE=&quot;mikediamond, post: 24693594, member: 1859&quot;]It&#039;s a form of split plating doubling.&nbsp; I wrote about it many years ago in my Coin World column.&nbsp; Here is the relevant paragraph: &quot;These tiny letters of exposed zinc could be explained once I realized that split plating doubling actually involves two sources of stress.&nbsp; In addition to the tensile stress mentioned earlier, there is direct physical trauma from the copper plating snagging on sharp edges located at the margins of recessed design elements in the die face.&nbsp;&nbsp; At periphery of the obverse face, the copper plating sometimes tears as it catches on the small posts and corners of the sunken letters of IN GOD WE TRUST.&nbsp; Rounded letters like O and G have a central post, while angular letters like T have two sharp corners at the junction of the crossbar and vertical bar.&nbsp; When the copper plating snags on these sharp edges it rips open, producing small, letter-shaped areas of exposed zinc.&quot;[/QUOTE]</p><p><br /></p>

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