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<p>[QUOTE=&quot;Numbers, post: 2364697, member: 11668&quot;]More detail (from the Huntoon book):</p><p><br /></p><p>The &quot;standard&quot; sheet combinations for Original Series NBNs were 1-1-1-2, 5-5-5-5, and 10-10-10-20.&nbsp; Each of these used the block sequence described above: plain red numbers for the first million sheets, plain blue numbers for the second million, red numbers with prefix &#039;A&#039; for the third million, and then through the alphabet from there.&nbsp; So the block sequences were:</p><p><br /></p><p>1-1-1-2: <span style="color: #ff0000">plain,</span> <span style="color: #0000ff">plain,</span> <span style="color: #ff0000">A, B, C, D, E</span></p><p>5-5-5-5: <span style="color: #ff0000">plain,</span> <span style="color: #0000ff">plain,</span> <span style="color: #ff0000">A, B, C, D, E, H, K, L, N, P, U</span></p><p>10-10-10-20: <span style="color: #ff0000">plain,</span> <span style="color: #0000ff">plain,</span> <span style="color: #ff0000">A, B, D</span></p><p><br /></p><p>A variety of other sheet combinations were in use, but they were all used by far fewer banks than the big three.&nbsp; As a result, all of them were still using serials in the first, plain-red (or occasionally blue!) block long after the big three combinations were into prefixed serials.&nbsp; Eventually, prefixes were added to all of these serial blocks as well, so that all serials would have a consistent look.&nbsp; These prefixes did not generally begin at &#039;A&#039;, and do not seem to have been chosen in any particular pattern--and in a few cases they weren&#039;t even letters:</p><p><br /></p><p>10-10-10-10: <span style="color: #ff0000">plain, Z, W</span></p><p><span style="color: #000000">10-10-20-20: <span style="color: #ff0000">plain, Y</span></span></p><p><span style="color: #000000">10-10-20-50: <span style="color: #ff0000">plain, T</span></span></p><p><span style="color: #000000">10-20-50-100: <span style="color: #ff0000">plain, R</span></span></p><p><span style="color: #000000">10-50-50-100: <span style="color: #0000ff">plain, A</span></span></p><p><span style="color: #000000">20-20-20-20: <span style="color: #ff0000">plain, X</span></span></p><p><span style="color: #000000">20-20-20-50: <span style="color: #ff0000">plain, V</span></span></p><p><span style="color: #000000">20-20-20-100: <span style="color: #ff0000">plain, U</span></span></p><p><span style="color: #000000">20-20-50-100: <span style="color: #ff0000">plain, W</span></span></p><p><span style="color: #000000">50-50: <span style="color: #0000ff">plain, B</span></span></p><p><span style="color: #000000">50-100: <span style="color: #ff0000">plain, (parentheses)</span></span></p><p><span style="color: #000000">50-50-50-100: <span style="color: #ff0000">plain, P</span></span></p><p><span style="color: #000000">100-100: <span style="color: #ff0000">plain, N</span></span></p><p><span style="color: #000000">500: <span style="color: #ff0000">plain, M</span></span></p><p><span style="color: #000000">500-500-500-500: <span style="color: #ff0000">plain, (parentheses)</span></span></p><p><span style="color: #000000">500-1000: <span style="color: #ff0000">plain, K</span></span></p><p><span style="color: #000000">500-500-500-1000: <span style="color: #ff0000">plain <span style="color: #000000">[not used after 1866, so never got prefixed]</span></span></span></p><p><span style="color: #000000">1000: <span style="color: #ff0000">plain, L</span></span></p><p><span style="color: #000000">1000-1000-1000-1000: <span style="color: #ff0000">plain, (parentheses)</span></span></p><p><span style="color: #000000"><br /></span></p><p><span style="color: #000000">Finally, the last few combinations were introduced after prefixes were already in use, so they never used plain numbers at all:</span></p><p><span style="color: #000000"><br /></span></p><p><span style="color: #000000">1-1-2-2: <span style="color: #0000ff">A</span></span></p><p><span style="color: #000000">20: <span style="color: #0000ff">X</span></span></p><p><span style="color: #000000">20-50: <span style="color: #0000ff">K</span></span></p><p><span style="color: #000000">50: <span style="color: #0000ff">A</span></span></p><p><span style="color: #000000">50-50-100: <span style="color: #0000ff">A</span></span></p><p><span style="color: #000000"><br /></span></p><p><span style="color: #000000">So your $20 note is from a rather unusual printing of just a single $20 note per sheet.&nbsp; Only something like 35,000 of these were printed, according to the book.</span></p><p><span style="color: #000000"><br /></span></p><p><span style="color: #000000">Believe it or not, I&#039;m actually *still* leaving out quite a lot of complications in the way the Original Series serialling worked.&nbsp; If you enjoy these sorts of details, you definitely want to get hold of the Huntoon book, because I don&#039;t have time to retype the whole thing here....&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></span>[/QUOTE]</p><p><br /></p>

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