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<p>[QUOTE=&quot;John Burgess, post: 4959488, member: 105098&quot;]It occurred on the bronze cents. 95% copper, 5% tin and zinc more commonly.</p><p>1864-1942 yes even Indian head cents.</p><p>1947-1962</p><p>Didn&#039;t happen on the steel cents for obvious reasons...plated with pure zinc and didn&#039;t happen on zincolns after 1982 which are pure copper plated.</p><p><br /></p><p>I&#039;m not really sure if it happened or not in the &quot;brass&quot; (gilding metal) years of 1944-1946 and 1963-1982 where it was 95% copper, 5% zinc. The composition is an easier alloy to make without tin in the mix. I don&#039;t think I&#039;ve ever seen one but I think the possibility exists if the alloy wasn&#039;t thoroughly melted and mixed.[/QUOTE]</p><p><br /></p>

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