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<p>[QUOTE=&quot;proofartoncircs, post: 961060, member: 25952&quot;]<p style="text-align: left"><span style="color: #000000">&lt;&lt;I shouldn&#039;t even mention this as I am rather hazy, and can find no references. When I was taking a Fortran class n the 70s, there was a problem involving an algorithm for determining if a serial number belonged to a specific bill in hand. All I can remember is that the letter and the serial number allowed a bank to know if it was correct or not.........Does anyone else know anything about that?&gt;&gt; </span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">Wow!&nbsp; Was that course out of date!&nbsp; I remember, vividly, the series 1953 USN&#039;s and SC&#039;s changing in that year.&nbsp; I almost turned a customer in for having counterfeit bills when he gave me two crisp notes aith sucessive serial numbers and the same check letter.&nbsp; I don&#039;t know when the $1 or FRN&#039;s changed.</span></p> <p style="text-align: left"><span style="color: #000000">&nbsp;</span></p> <p style="text-align: left"><span style="color: #000000">With small size notes prior to 1953 (with the exception of type 1 NBN&#039;s), you could divide the</span></p> <p style="text-align: left"><span style="color: #000000">&nbsp;serial number by 6.&nbsp; A remainer of 1 would be check letter A or G.</span></p> <p style="text-align: left"><span style="color: #000000">2 would be B or H.&nbsp; 3 would be C or I.&nbsp; 4 D or J.&nbsp; 5 E or K.&nbsp; 0&nbsp; F or L.&nbsp; </span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">&nbsp;</span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p>[/QUOTE]</p><p><br /></p>

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