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<p>[QUOTE=&quot;physics-fan3.14, post: 2262977, member: 19165&quot;]I&#039;m testing your knowledge a little bit, yes. But, I&#039;m also trying to make this an educational thread for many of the other readers of the forum. You&#039;re one of the few who has posted a coin that was correctly labelled as MDD. </p><p><br /></p><p>And you passed with flying colors <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p><br /></p><p>For those reading: coins of this era were hubbed and had the mint mark punched separately into each working die. If you ever see &quot;doubling&quot; on both the devices and the mint mark, as on this coin, your immediate first thought should be machine doubling. As with every rule, there are exceptions - but they are incredibly infrequent.[/QUOTE]</p><p><br /></p>

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