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<p>[QUOTE=&quot;KBBPLL, post: 26095927, member: 104064&quot;]Roger Burdette in the Winter 2024 BCCS journal proposed a theory that the early 1900s New Orleans &quot;mumps&quot; half dollars were caused by thin planchets. He proposed that an adjustable screw/cylinder inside the blank punch with a rounded end is extended below the punch. This pushes metal downwards before the planchet is cut, resulting in slightly concave blanks. Supposedly this could be used on coin strips that were rolled too thin, to make the blanks the proper weight. Myself, I can&#039;t really picture how that works, other than perhaps it stretches enough metal into the blank from the strip to bring it up to correct weight. Then the planchets had to be flattened, but he doesn&#039;t go into that part. </p><p><br /></p><p>So yes, thin planchets could have something to do with all the weak strikes for 1890-O Morgans. Or maybe they didn&#039;t properly dish the dies. Or strike pressure was too low. Or a combination of factors - whatever didn&#039;t force enough metal into the die to fill it.[/QUOTE]</p><p><br /></p>

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