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<p>[QUOTE=&quot;Nick Zynko, post: 4364463, member: 110450&quot;]Not double, it&#039;s a common Filled &quot;S&quot; Mint Mark as opposed to a clear &quot;S&quot;.&nbsp;&nbsp; Its the difference between a Type-1 and Type-2 1979 proof set actually. Bad quality control when forming the mint mark on those. </p><p><br /></p><p>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Here is one way to understand the doubling problem in coin manufacturing: -Think of the difference between true HUB doubling (Double DIE) and machine doubling as the master hub that is used to make Working Dies is the cause. The Master moved/shook when transferring the image to the working Die that strikes the coin (All coins struck with that impaired Die will be truly doubled) vs a single coin shook/moved in its retaining collar when struck with a perfect working die. (A single or a sparse few coins are impaired)&nbsp; A true doubled die is normally : not always: pretty dramatic. Look carefully at the Lincolns of 1955, 1972 DDO &amp; 1983 DDR.&nbsp; Machine doubling is caused in the coin press normally very slight and weak. Barely noticeable by eye.[/QUOTE]</p><p><br /></p>

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