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<p>[QUOTE=&quot;beef1020, post: 961133, member: 24544&quot;]Wow!&nbsp; Was that course out of date!&nbsp; I remember, vividly, the series 1953 USN&#039;s and SC&#039;s changing in that year.&nbsp; I almost turned a customer in for having counterfeit bills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.</p><p>&nbsp;</p><p>With small size notes prior to 1953 (with the exception of type 1 NBN&#039;s), you could divide the</p><p>&nbsp;serial number by 6.&nbsp; A remainer of 1 would be check letter A or G.</p><p>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; </p><p>[/COLOR][/LEFT][/QUOTE]</p><p><br /></p><p>Just curious if you know why they chose mod 6 to determine the check digit?&nbsp; I tend to use luhn algorithms because of their simplicity to check, I can&#039;t image many people can divide by 6 in their head...[/QUOTE]</p><p><br /></p>

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