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<p>[QUOTE=&quot;cpm9ball, post: 3949209, member: 24633&quot;]<b>&quot;Another form of doubling that has been frequently confused with doubled die doubling is a form of doubling known as abrasion doubling. 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;. This form of doubling gets its name from the fact that it is caused by rubbing an abrasive on the face of the die. This is done deliberately and as a matter of routine in an attempt to remove die clash marks.&quot;</b></p><p><br /></p><p>Now, if you look at the first image in your Post #4, you can see that the abrasion marks in the field are consistent with die polishing. The raised marks from polishing the die are not necessarily parallel as you would find associated with die deterioration. </p><p><br /></p><p>However, the 1988-P quarter in your Post #1 displays neither die polishing nor die deterioration. It is simply machine doubling.</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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