Hey, what is with the double letter prefix on notes? I have here a 2004A 20$ star note with the prefix GK. All I know is that one of the letters indicates which federal reserve bank it comes from. Enlightenment on the subject would be appreciated :)
Starting with Series 1996 notes, the first letter corresponds to the Series (all Series 1996 notes start with A). Subsequent advance this letter by one for each series.
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