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<p>[QUOTE=&quot;Insider, post: 6798351, member: 24314&quot;]Some <i>older</i> authenticators referred to/named any raised lumps on a coin in places where they are not part of the design &quot;extraneous metal&quot; (EM).&nbsp; Obviously, EM can have several causes and many coins that have this characteristic &quot;defect&quot; are 100% genuine.&nbsp; For example, a genuine coin struck with rusted dies will have this characteristic.&nbsp; Unfortunately, in the 70&#039;s many coin &quot;experts&quot; called any coin with EM a counterfeit.</p><p><br /></p><p>One thing used to determine the cause of EM is whether it is smooth or rough.&nbsp; Casting defects in the form of bubbles are smooth.&nbsp; Heating a coin can cause rounded marks and our plated cents often have plating blisters.&nbsp; Incidentally, many genuine gold &amp; silver ancients have rough granular EM in their relief design.</p><p><br /></p><p>Without knowing anything about ancients, the EM on the coin above looks like it is <b>mostly corrosion</b>; however, there are several round, bubble-like lumps that should make a collector of genuine coins pass.</p><p><br /></p><p>PS Green = corrosion spot.[/QUOTE]</p><p><br /></p>

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