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<p>[QUOTE=&quot;Roman Collector, post: 2482005, member: 75937&quot;]The dimple on the flans of these coins is called a &quot;centration dimple&quot; and how they get there is a matter of some controversy. Some feel that they result from some sort of rotary grinder to smooth the flan prior to striking the coins. There are concentric ridges on many of these coins, indicating something was rotating on the flan--or that the flan was rotating on something. Some feel that the flans were turned on a lathe or similar apparatus. Some feel that the dimples are marks made from tongs used to remove the flan from the furnace prior to striking. </p><p><br /></p><p>One of the members of this forum, Doug Smith, has an article about these:</p><p><br /></p><p><a href="http://www.forumancientcoins.com/dougsmith/pit.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.forumancientcoins.com/dougsmith/pit.html" rel="nofollow">http://www.forumancientcoins.com/dougsmith/pit.html</a>[/QUOTE]</p><p><br /></p>

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