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<p>[QUOTE=&quot;Conder101, post: 3100804, member: 66&quot;]The Panama coinage was made using the same planchets as US coins except the half balboas in 1971 and 72 which used the 40% silver &quot;half dollar&quot; planchets.&nbsp; But those half Balboa planchets being used to strike half dollars in 1971 or 72 is unlikely as all the Panama coinage was struck in San Francisco, and all the 72&#039;s were proof coins.&nbsp; There is a small chance that the 40% silver planchets may have accidently gotten mixed in with rejected copper nickel proof planchets that were shipped to Denver for use in making business strikes.&nbsp; It is thought that that is how the 40% 1974 D and 77 D coins were created, rejected 40% silver blanks accidentally got shipped to Denver mixed with rejected CuNi proof planchets.[/QUOTE]</p><p><br /></p>

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