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<p>[QUOTE=&quot;physics-fan3.14, post: 2327419, member: 19165&quot;]Two completely different causes, with two completely different appearances. </p><p><br /></p><p>Machine damage, or strike damage, occurs right after the striking of the coin. As the dies begin to pull apart, they may &quot;bounce&quot; or &quot;jiggle.&quot; This slight shifting of the die will &quot;drag&quot; the devices, and produce a torsional effect. The resulting appearance will be flat and shelflike, often with a rather shiny appearance. </p><p><br /></p><p>Die Deterioration Doubling occurs late in a die&#039;s life, after it has struck many coins. The friction of the coin metal rubbing on the surface of the die will wear away the fine details of the die, and may cause the devices to have a bloated or distorted appearance. The appearance is irregular, such as shown in the OP. It isn&#039;t flat and shelf-like, so some people confuse it for hub doubling. However, it isn&#039;t the rounded, notched, secondary image of true hub doubling - it is instead a shadowy outline of the devices.[/QUOTE]</p><p><br /></p>

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