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<p>[QUOTE=&quot;Numbers, post: 430698, member: 11668&quot;]The letters start over with each new series, so it&#039;s not often that a series runs long enough to get all the way up to X.&nbsp; The most recent times it happened were in the 1988A and 1995 $1&#039;s (which are largely out of circulation by now) and the 1996 $100&#039;s (because they printed a ton of that series to replace all the older-design $100&#039;s in circulation).</p><p><br /></p><p>The only letters that aren&#039;t used at all are O and Z.&nbsp; And even Z was used formerly, with the last time being on the 1957 $1 silvers....</p><p><br /></p><p>If you go back far enough, you can even find a note with <a href="http://www.donckelly.com/lg_type/f233vf.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.donckelly.com/lg_type/f233vf.html" rel="nofollow"><b>two</b> X&#039;s in the serial numbers</a>....&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie6" alt=":cool:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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