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<p>[QUOTE=&quot;-jeffB, post: 3603540, member: 27832&quot;]Flow marks aren&#039;t all radial. If coins were made by putting a metal <i>ball</i> into a press, they might be. But when you strike an upset planchet, metal flows from the <i>low points</i> of the design toward the <i>high points</i> of the design. (Thanks yet again to [USER=112]@GDJMSP[/USER] for pointing this out in a thread years ago.)</p><p><br /></p><p>This is especially prominent on Mercury dimes, which have <i>weird</i> twisty luster in the reverse fields. I haven&#039;t paid much attention to luster on Washington quarters, but I&#039;m guessing the same thing might happen there. I&#039;ll try to remember to look for it on some lustrous examples.[/QUOTE]</p><p><br /></p>

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