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<p>[QUOTE=&quot;Conder101, post: 1351307, member: 66&quot;]Stang, ALL of the 2009 proof cents were made of copper and weigh 3.1 grams.</p><p><br /></p><p><br /></p><p>No they are the same thickness. the greater weight comes from the denser material they are made from.&nbsp; The only way your coin would be twice the thickness would be if someone had been beating on the edge.&nbsp; Now a proof cent IS thicker at the edge than a business strike but that is because the rims are fully struck up.&nbsp; Something almost never seen on a business strike.[/QUOTE]</p><p><br /></p>

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