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<p>[QUOTE=&quot;desertgem, post: 3012965, member: 15199&quot;]In 1967 , they were using a double squeeze hubbing process to produce the dies, and since the die had to be removed to be annealed to soften it a little so the hub could produce a deeper impression. When returning the treated die for&nbsp; second squeezing, if there was <b>not identical </b>placement, the 2 impressions would both be visible, but the minor impression is going to be the same or close in height. If it is perhaps a tiny amount less, it will still be rounded and raised.&nbsp; This results in a true doubled die.</p><p><br /></p><p>In the case where the die is exact, and is being pressed into the planchet to make a coin, the action is ( for several possible reasons) not exact in maintaining location ( loose in the press die holder for example) it can cause a smaller flattened edge on the devices of the coin. If chatter occurs, this effect may be on different levels. etc. This is not true doubling, it is Mechanical Doubling or Mechanical Doubling Damage.</p><p><br /></p><p>And I will not even discuss single squeeze theory as actual die doubling.</p><p><br /></p><p>Several references ( I recommend Wexler and Flynn&#039;s Authoritative Reference on Lincoln Cents ( 2nd ed. ) )&nbsp; are invaluable if one desires to collect in this area.[/QUOTE]</p><p><br /></p>

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