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<p>[QUOTE=&quot;Collecting Nut, post: 4168914, member: 74863&quot;]The correct term is Doubled Die so there&#039;s your first lesson. Lol There are numerous types of doubling but only one is worth any money as the rest are common. Worthless doubling is called NAV or No Added Value Doubling.</p><p><br /></p><p>MD is Mechanical Doubling </p><p>DDD is Die Deterioration Doubling </p><p>These are the two list common forms of doubling. The best coin to research for the correct doubling is the 1955 DDO Lincoln Cent. I&#039;ll leave the rest up to you. Have fun, learn and enjoy the hobby.[/QUOTE]</p><p><br /></p>

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