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<p>[QUOTE=&quot;DonnaML, post: 8074173, member: 110350&quot;]These aren&#039;t centration dimples. Centration dimples are from using some sort of compass on the dies while engraving the design, so they appear as raised dimples on the coins themselves. These aren&#039;t raised: they&#039;re holes, and were made on the flans rather than on the dies, as [USER=80556]@David@PCC[/USER] points out. As he mentions, there&#039;s a theory that they were part of the process of using a lathe on the flans. See the article entitled &quot;Lathe Machining of Bronze Coin Flans&quot; beginning at <a href="http://www.classicalcoins.com/flans1.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.classicalcoins.com/flans1.html" rel="nofollow">http://www.classicalcoins.com/flans1.html</a>, as well as the discussion in the thread at <a href="https://www.cointalk.com/threads/finally-a-diadumenian.361348/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/finally-a-diadumenian.361348/">https://www.cointalk.com/threads/finally-a-diadumenian.361348/</a>. See also Butcher, Kevin, <i>Roman Provincial Coins: An Introduction to the Greek Imperials</i> (Seaby, London, 1988) at p, 67: &quot;The coins [of Moesia Inferior] frequently have a small circular depression in the centre of the obverse and reverse, possibly the result of being clamped in a sort of lathe device used to smooth off the edges of the coin.&quot;</p><p><br /></p><p>Here&#039;s an example I own from Marcianopolis:</p><p><br /></p><p><img src="https://www.cointalk.com/attachments/macrinus-diadumenian-hermes-photo-jpg-jpg.1295867/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>One from Tomis:</p><p><br /></p><p><img src="https://www.cointalk.com/attachments/philip-ii-moesia-tomis-gryphon-wheel-jpg-version-jpg.1295858/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Anchialus in Thrace:</p><p><br /></p><p><img src="https://www.cointalk.com/attachments/gordian-iii-tranquillina-anchialus-thrace-jpg-version-jpg.1295863/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>I don&#039;t think that the fact that these indentations sometimes appear on serrated coins disproves the theory. The serration could have been something done afterwards. Note how perfectly round the coin above would be without the serrations.[/QUOTE]</p><p><br /></p>

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