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<p>[QUOTE=&quot;johnmilton, post: 3559185, member: 101855&quot;]It is not unusual to have the Proof cent in these sets tone. Some years are worse than others for that because of the packaging the mint used at the time. The inserts were not inert, or it might have something to do with the cleaning solutions the mint used on the coin blanks. (planchets or flans) before the coins were struck.</p><p><br /></p><p>It&#039;s better if the cent is bright and not toned, but given the low prices for these sets, it&#039;s not a tragedy in this case.[/QUOTE]</p><p><br /></p>

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