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<p>[QUOTE=&quot;Searcher64, post: 7950291, member: 21828&quot;]I was referring to the series changes as to the year.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; <a href="https://en.wikipedia.org/wiki/Series_of_1928_(United_States_Currency)" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Series_of_1928_(United_States_Currency)" rel="nofollow">Series 1928</a> was the first series of modern, small-sized notes issued. Since then, the series year has been changed when there is a major design change to a bill; a minor design change is indicated by a letter suffix being added to the series year. Major design changes were rare until 1974, when <a href="https://en.wikipedia.org/wiki/William_E._Simon" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/William_E._Simon" rel="nofollow">William E. Simon</a> became Secretary of the Treasury. Before 1974, a change to either the signature of the <a href="https://en.wikipedia.org/wiki/United_States_Secretary_of_the_Treasury" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/United_States_Secretary_of_the_Treasury" rel="nofollow">Secretary of the Treasury</a> or the <a href="https://en.wikipedia.org/wiki/Treasurer_of_the_United_States" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Treasurer_of_the_United_States" rel="nofollow">Treasurer</a> was considered a minor change; after 1974, a new Secretary of the Treasury was considered a major change. (The only exception to this was in 1979, <a href="https://en.wikipedia.org/wiki/G._William_Miller" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/G._William_Miller" rel="nofollow">G. William Miller</a>&#039;s signature appeared on Series 1977A instead of Series 1979.) A change in Treasurer is still considered a minor change. The 2017A series apparently was due to a minor change in production, possibly of the ink used.<a href="https://en.wikipedia.org/wiki/Series_(United_States_currency)#cite_note-1" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Series_(United_States_currency)#cite_note-1" rel="nofollow">[1]</a> Changes in design, such as the recent changes to the <a href="https://en.wikipedia.org/wiki/United_States_twenty-dollar_bill" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/United_States_twenty-dollar_bill" rel="nofollow">$20 bill</a> to deter <a href="https://en.wikipedia.org/wiki/Counterfeit_money" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Counterfeit_money" rel="nofollow">counterfeiting</a>, are still considered major changes.[/QUOTE]</p><p><br /></p>

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