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<p>[QUOTE=&quot;Numbers, post: 2993170, member: 11668&quot;]The &quot;block&quot; is the combination of letters that appears in the serial number--so for example K12345678G is from the KG block.&nbsp; Some collectors try to get all the different blocks that were printed in a particular denomination/series.&nbsp; It&#039;s a bit more of a challenge than just collecting all twelve districts; the Series 2013 $1 has had 107 different blocks printed so far, for example, and might yet get a couple more before Series 2017 takes over.[/QUOTE]</p><p><br /></p>

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