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<p>[QUOTE=&quot;mikediamond, post: 338531, member: 1859&quot;]I would think it&#039;s a peculiar form of die deterioration doubling.&nbsp; But you also may have surface film doubling occurring here.&nbsp; That occurs when the coin or die is covered with a thin layer of oil or grime.&nbsp; As the planchet expands beneath the strike, the grime extends beyond the struck design elements in a radial fashion, as seen here.</p><p><br /></p><p>Then again, some Canadian coins show a similar form of doubling, which is said to be due to a breakdown of the chrome plating.&nbsp; But our dies don&#039;t have a chrome layer.&nbsp; Study under a microscope would undoubtedly clarify the situation.</p><p><br /></p><p>FYI, machine doubling is the same as strike doubling, mechanical doubling, machine doubling damage, machine damage doubling, ejection doubling, and shift doubling.&nbsp; Too many names, for sure.[/QUOTE]</p><p><br /></p>

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