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<p>[QUOTE=&quot;rmpsrpms, post: 1830672, member: 31773&quot;]I would base the analysis not on mint records or other documentation (given the inconsistencies/contradictions/confusion)&nbsp; but on examination of cents that were minted during the WW2/post-WW2 era. Based on the &quot;shellcase&quot; toning patterns on Cents I own or have examined, I&#039;d say the use of shell casings was:</p><p><br /></p><p>1944: very limited, but with some evidence of use</p><p>1945: extensive, especially on S-mint coins</p><p>1946: limited, mostly present on S-mint coins</p><p><br /></p><p>I don&#039;t know why 1944 seemed to have less use than 1945, but it may be that either the shell casings were only used later in the year, or perhaps a better job was done in removing the impurities, or some other reason.</p><p><br /></p><p>I also don&#039;t know why in 1945 and 1946 more S-mint coins seem to show shellcase toning than P or D. Did all the planchets come from a single source under contract, or were the contracts for each mint separate and/or from multiple sources?</p><p><br /></p><p>One thing is for sure, there are coins from 1944 through 1946 that show the toning caused by sulfuric impurities in the brass/bronze mix, so I would conclude based on the evidence (not documentation) that shellcases were likely used from at least the end of 1944 through a substantial part of 1946.[/QUOTE]</p><p><br /></p>

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