The green and black overprinting of the serial numbers and Treasury seal and the Federal Reseve District numbers and seal is applied at the final stage of a note’s production, after the faces and backs are printed.
The prefix letter “B” identified the note as overprinted for the New York Federal Reserve Bank, while the suffix letter “A” identifies it as being from the first “block” of sequence of notes printed (the suffix letter is advanced each time the serial numbers reach their limit).
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