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Message:: [QUOTE="Numbers, post: 1973041, member: 11668"]In the 1928 series, they're the lowest and highest serial numbers that have been reported to the authors of the book. Back then, the series transitions weren't sharp.  When the BEP started to print 1928B notes, there would be a period when they were using both new 1928B printing plates and old 1928A printing plates at the same time.  So notes of both series would end up mixed together in serial number sequence, until eventually all the old 1928A plates wore out. So the highest number printed for Series 1928A will be *above* the lowest number printed for Series 1928B.  And in general the BEP didn't worry about recording the last serial number printed in each series (when the last old-series plate finally wore out), so all the reference guides can do is report the highest serial that's been seen. Starting in the '50s or '60s, we've generally got official BEP records of lowest/highest serials printed for each series, and the books usually list those instead of giving the lowest/highest serials observed.[/QUOTE]