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<p>[QUOTE=&quot;dougsmit, post: 4971475, member: 19463&quot;]<a href="http://www.forumancientcoins.com/dougsmith/feac73xxi.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.forumancientcoins.com/dougsmith/feac73xxi.html" rel="nofollow">http://www.forumancientcoins.com/dougsmith/feac73xxi.html</a></p><p><a href="http://www.forumancientcoins.com/dougsmith/officina.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.forumancientcoins.com/dougsmith/officina.html" rel="nofollow">http://www.forumancientcoins.com/dougsmith/officina.html</a></p><p>My pages above cover XXI and officinae.&nbsp; It is good to remember that mints were free to do these things &#039;their way&#039; so there is no single explanation to the matter.&nbsp; XXI meant a ratio of 20 parts base metal to one part silver using Roman numerals.&nbsp; Some mints preferred to use Greek so XXI became KA for twenty and one.&nbsp; This works out to about 4.7% silver since the Romans did not say one part in 20 but said one part added to 20 which we would say 1/21.&nbsp;&nbsp; </p><p><br /></p><p><br /></p><p><br /></p><p>&nbsp;I believe the &#039;O&#039; is actually a Q standing for the quarta (4th) officina.</p><p><br /></p><p>Whenever you show a coin asking for help, it is best to show both sides.&nbsp; If nothing else, that would help people not familiar with the coins to learn who issued which ones.&nbsp; More than one mint and more than one ruler used Clementia Temporum.&nbsp; Specialists will know what was on the obverse of each of your coins but some of us are not that far along in our journey.</p><p><br /></p><p>Below is a 20:1 expressed KA.&nbsp; In this case the B means officina two.&nbsp; The obverse shows Florian. </p><p>[ATTACH=full]1194823[/ATTACH][/QUOTE]</p><p><br /></p>

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