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<p>[QUOTE=&quot;Shrews1994, post: 3265191, member: 96343&quot;]Copyed and pasted.</p><p><br /></p><p>Cupping is almost always toward the hammer die.</p><p><br /></p><p>The cause of cupping is not entirely clear.&nbsp; Sometimes it’s guided by a stiff collar that is just barely deployed above the level of the anvil die.&nbsp; But in many cases there is no</p><p>source of physical guidance.&nbsp; That is the case for the two 1999 cents shown below.</p><p><br /></p><p><img src="http://www.error-ref.com/wp-content/uploads/2013/12/58410831.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>The 1999 cent shown above developed an almost vertical wall as it curled toward the obverse (hammer) die.&nbsp; A corona of exposed zinc formed at the perimeter of the design on both faces[/QUOTE]</p><p><br /></p>

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