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<p>[QUOTE=&quot;physics-fan3.14, post: 627720, member: 19165&quot;]It should be emphasized that Longacre doubling, like the machine doubling discussed last week, is not a true doubled die. &quot;Doubled die&quot; refers only to hub doubling, and I&#039;m hoping you devote a lengthy thread to hub doubling somewhere in this excellent series, Frank. </p><p><br /></p><p>Longacre doubling is very common since it occurs on the master die, and adds no premium to a coin. Sometimes, specatular and exciting examples showing severe Longacre doubling on almost all elements will show up - if you are going to try and collect one, these are the pieces to wait for. </p><p><br /></p><p>Great job![/QUOTE]</p><p><br /></p>

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