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<p>[QUOTE=&quot;CaptHenway, post: 4400339, member: 13813&quot;]Let us discuss &quot;Possibility&quot; and &quot;Probability.&quot;</p><p><br /></p><p>This coin is &quot;Possible&quot; because when the San Francisco Assay Office began striking Special Mint Sets and later Proof Sets, these sets included some denominations that the SFAO was not striking for circulation, and not every planchet was suitable for Proof (or SMS) production for various reasons. Up through the 1964 Proof sets, the Philadelphia Mint could simply divert such reject planchets into the regular production pipelines, but the SFAO only struck cents for circulation from 1968 to 1974 and nickels 1968 to 1970.</p><p><br /></p><p>Outside those two exceptions, the SFAO had to ship any reject planchets to the Denver Mint for regular coinage. That is how we got 40% silver 1974-D and 1977-D Ikes, and 1977-D Kennedy halves. I do not know if they were shipped in generic steel drums, or in standard Mint hoppers.</p><p><br /></p><p>If in standard Mint hoppers, then Denver would have had to ship an equal number of standard Mint hoppers back to San Francisco or else SF would eventually run out of hoppers. If so, then it would be possible that a struck D-mint cent was accidentally stuck in one of those hoppers, and that it was filled with Proof quarter planchets and overstruck as a Proof Bicentennial quarter. All of this is a &quot;Possibility.&quot;</p><p><br /></p><p>As to &quot;Probability,&quot; it is about as &quot;Probable&quot; as me winning a billion dollar Powerball and having some young Hollywood starlet decide that she wants to marry me. Now take that probability of one piece happening and multiply it by itself as many times as there are of these &quot;flukey Proof errors.&quot; I&#039;ll wait while you do the math.</p><p><br /></p><p>TD[/QUOTE]</p><p><br /></p>

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