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<p>[QUOTE=&quot;wlwhittier, post: 1685114, member: 18320&quot;]I can&#039;t say anything about weight...but copper <i>can</i> be hardened in a variety of ways, and a harder coin will ring with a higher note than an as-minted penny.</p><p><br /></p><p>The process of forming the planchet, and the followed striking of the copper coin would certainly work-harden it.&nbsp; I don&#039;t know whether that was offset by intentional annealing at the mint, but I doubt it; too costly, and would degrade wear-resistance. But if a penny were in a house fire, say, and cooled slowly as the ashes protected it, I would expect it to be harder than it was when it left the mint...so it would ring higher.</p><p><br /></p><p>This is mostly thinking out loud, so for those of you in the know about such things, I&#039;m &#039;Crossing Your Tee&#039;.</p><p><br /></p><p>I&#039;m prepared for the broadside salvos I may have invited.[/QUOTE]</p><p><br /></p>

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