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<p>[QUOTE=&quot;Conder101, post: 3981587, member: 66&quot;]In THEORY a 1974 D in 40% silver could be possible (Not Philadelphia)&nbsp; The 40% silver bicentennials were struck in San Francisco in 1975.&nbsp; The 1974 dates were frozen for the first half of 1975 so 1974 D halves were being struck in 75.&nbsp; When San Francisco had proof planchets that failed quality control they would be shipped to Denver to be used for business strikes.&nbsp; Now the 40% silver planchets were not supposed to be shipped to Denver but we know that at least a few were.&nbsp; (This is the source of the 40% 1977 D halves and Ikes)&nbsp; Could this have happened in 1975 while the 74&#039;s were being struck?&nbsp; Maybe.</p><p><br /></p><p>A 74 S 40% silver proof strikes me as unlikely as the 1974 proof half production should have ended before the 40% silver planchets were available in 1975.&nbsp; And the listing calling them 90% has to be wrong.&nbsp; No 90% silver coinage was done in San Francisco between 1955 and 1982.&nbsp; No place for 90% silver planchets to come from.[/QUOTE]</p><p><br /></p>

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