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<p>[QUOTE=&quot;paddyman98, post: 8584519, member: 44615&quot;]What happens is oil or grease that is rubbed/wiped every once in a while on the dies during the striking of coins will become compacted and hard so it won&#039;t allow the blank to be properly struck. The dies have an incused image so the gunk gets into them.</p><p>It usually happens towards the end of the dies life after several thousand strikes. Struck through grease is a die state - worn die/die deterioration <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie103" alt=":yack:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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