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<p>[QUOTE=&quot;cladking, post: 1930227, member: 68&quot;]Yes.</p><p>&nbsp;</p><p>But the zinc production makes the estimate of attrition of the coppers nearly meaningless without a lot more data.&nbsp; You found 48% of 1961 P&amp;D cents are missing from the universe of copper coins but, I suspect, it&#039;s a much larger percentage of the original mintage that&#039;s missing. </p><p>&nbsp;</p><p>To get an estimate of the %age of original mintage missing you&#039;ll need to understand the universe of zinc pennies.&nbsp; Once you know the attrition rate on them (and it won&#039;t be even) you can get an estimate of the size of the universe of all cents in circulation and then can estimate the percentage of all 1961 cents surviving.&nbsp; I suspect it&#039;s only about 25% and it would be even lower than this except that penny velocity has become so incredibly low. In 1961 a penny would be spent about five times a month but now it&#039;s barely five times a year.&nbsp; It&#039;s less likely to be lost sitting in a coffee can.[/QUOTE]</p><p><br /></p>

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