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<p>[QUOTE=&quot;John Burgess, post: 4978567, member: 105098&quot;]yes in a way very similar, the class 2 doubling goes outward towards the rim, the class 6 doubling goes inward towards the center in a lot of cases, though it normally looks like &quot;fat&quot; letters or numbers.</p><p><br /></p><p>Single squeeze hubbing got rid of the class 2, class 6 still happens with single squeeze, I don&#039;t know if they ever settled on how the class 6 exactly happens.</p><p><br /></p><p>The theory for class 2 is that a die was impressed with a hub, the hub was annealed and then a 2nd impression is made on the die. During annealing the temperature slightly changes the diameter of the hub (doesn&#039;t always happen, but it happens according to the mint especially how many times they used a hub to make a die and how many times they re-anneal it), so the second impression is a bit closer to the rim than the first because the hub expanded.</p><p><br /></p><p>Something like that. it&#039;s gone now with the single squeeze hubbing, just one impression nowadays.[/QUOTE]</p><p><br /></p>

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