Baron of Bastanchury

Following the serial year is a final letter block indicating the note’s series code for that series year. This letter (or, potentially, letters, typically A-Z) corresponds to a minor variation for that note within its series year, and may be arbitrarily and non-sequentially chosen within the 26-letter Roman alphabet. All notes that follow the format and appearance of the original series year will have the same letter code(s) in this field; if the Bank of Westarctica decides to issue a different kind of note within the same series year, then that note will bear a different letter(s) here. Only if more than 26 such series letters become necessary for a given series year will the field contain two letters (e.g., “FR” or “AG” or any other two-letter code). There is no upper limit to the length of the series code which a note may bear, so long as each series note is identical in all aspects of its appearance (other than its serial number) to other notes in the same series year and can be clearly differentiated from other notes in different series. The series code does not indicate the note’s series year or printing year, though certain series years will only bear certain series codes (which means a series year may sometimes be deduced backwards from an apparent series code). All bills must have a series code, even if the appearance of that note never varies (in which case all such notes issued for that series year would have the same single- or double-letter series code letter).