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Message:: [QUOTE="Numbers, post: 3630945, member: 11668"]They start at 00000001, yes. Denominations up to $20 are printed in runs of 6,400,000 notes, so after fifteen runs, the serialling is up to 96000000.  At that point, there aren't enough serials left for another run, so they start over at 00000001 (and increment the suffix letter). The $50's and $100's are printed in runs of 3,200,000 notes, so they can fit thirty-one runs per block, and so the serials go up to 99200000. No serials higher than 99200000 have been printed for circulation since the '80s.  But higher serials have sometimes been used for the uncut sheets the BEP sells to collectors.  Decades ago, when the standard print runs were smaller, the serials printed for circulation went all the way to 99999999. "Fancy" serials like 11111111 are treated normally by the BEP (although they're likely to be intercepted by alert bank tellers before you have a chance to find them in circulation).  For the past several decades, though, nearly all serials ending in 9999 or 0000, and many serials ending in 00002, were systematically pulled for quality-control testing (and replaced by star notes); this made certain specific serial numbers largely unavailable.  Within the past few years, the BEP has started using newer equipment that samples notes randomly, rather than systematically, for quality control; thus those once-unavailable serials have been appearing in circulation again.[/QUOTE]