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<p>[QUOTE=&quot;GSDykes, post: 3948992, member: 73321&quot;]quotes from Wexler&#039;s website, and The Asylum, as are the images, below.</p><p><br /></p><p><i> </i></p><p><i>A similar variety on a 1957-D Lincoln cent which also had a genuine doubled die &quot;extra eyelid&quot; was found both with and without the throat doubling, something that would not be possible if the throat doubling were part of the genuine doubled die doubling.&nbsp; This one and a number of others with similar doubling were eventually deleted from the doubled die files.</i></p><p><br /></p><p style="text-align: left"><img src="http://doubleddie.com/mediac/450_0/media/Abrasion$20Doubling$201956-D$201c$20$282$29$20$28neck$29.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Perhaps some additional info, on this odd &quot;doubling&quot;. If just MD, it seems to be quite restricted. Here is another possibility!</p><p><br /></p><p>From Wexler&#039;s website</p><p><img src="http://doubleddie.com/img/content/144864_144868.gif" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Another form of doubling that has been frequently confused with doubled die doubling is a form of doubling known as <span style="color: #ff4dff">abrasion doubling</span>.&nbsp; In fact, a number of specimens of abrasion doubling were actually once listed as doubled dies, so at one time it even fooled many of the &quot;experts&quot;.&nbsp; This form of doubling gets its name from the fact that it is caused by rubbing an abrasive on the face of the die.&nbsp; This is done deliberately and as a matter of routine in an attempt to remove die clash marks.</p><p><br /></p><p>For those unfamiliar with die clashes and what causes them, a quick review of how coins are struck is in order.&nbsp; Planchets are struck by a pair of steel rods called dies.&nbsp; One die contains the obverse design and the other die contains the reverse design.&nbsp; In the coining presses a planchet is fed between the two dies and comes to rest on one of them (usually the reverse die) which is known as the anvil die.&nbsp; A collar surrounds the planchet to prevent the planchet metal from squeezing outward at the moment of impact in the striking of the coins.&nbsp; The hammer die (usually the obverse die) strikes the planchet with great force squeezing the planchet metal into the die cavities on both the obverse and reverse dies thus forming the design on the coin.</p><p><br /></p><p>Every now and then there is a malfunction in the mechanism that feeds the planchets into the coining chamber and a planchet will fail to be fed between the dies.&nbsp; The dies will come together without a planchet between them and strike each other.&nbsp; The force of the strike leaves part of the obverse design on the reverse die and part of the reverse design on the obverse die.&nbsp; When planchets subsequently are fed between the dies to be struck, the coins will bear these die clash images.</p><p><br /></p><p>On the Lincoln Memorial cents the clash marks appear as Memorial columns on the obverse which were usually seen behind the neck in the area of the TY of LIBERTY, below Lincoln&#039;s beard, and on some of the stronger clashes they are seen to the right of Lincoln&#039;s face and sometimes even on Lincoln&#039;s neck.&nbsp; On the reverse die the clash marks normally appear as an inverted TY of LIBERTY in the upper part of the first two Memorial bays and an incuse outline of Lincoln&#039;s beard in the bays to the right of the statue of Lincoln.</p><p><br /></p><p>The technique for removing these die clash marks is to rub the surface of the die with an abrasive.&nbsp; If the die is abraded too vigorously in the area of the incuse design elements, the abrasive will eat into the surface of the die in those areas very much like the erosion that takes place in normal die deterioration. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie14" alt=":angelic:" unselectable="on" unselectable="on" /> Again, these depressed areas from the abrasion process will appear as raised areas on the struck coins resulting in &quot;doubling&quot; of the affected letters or <span style="color: #ff00ff">other design elements.</span></p><p><br /></p><p style="text-align: left"><img src="http://doubleddie.com/mediac/450_0/media/Abrasion$20Doubling$201956-D$201c$20$281$29$20$28throat$29.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />look familiar?</p> <p style="text-align: left">Odds are that the quarter in the OP is MD, as abrasion doubling is rather rare. I wonder if the flat shelf of MD, is&nbsp; characteristic of abrasion doubling as well?</p><p>[/QUOTE]</p><p><br /></p>

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