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<p>[QUOTE=&quot;Conder101, post: 140151, member: 66&quot;]The raised lumps on the cast coins are caused by voids in the molds.&nbsp; The voids are usually caused when little pieces of the mold material adhere to the coin when it is removed from the molding material or from bubbles of air trapped on the surface of the coin when it is pressed into the mold material.&nbsp; There can also be pits in the coin which are caused by bubbles of gas in the molten metal.[/QUOTE]</p><p><br /></p>

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