(a) Plate Position Letters and Numbers
Indicates the position of the note on the 32-subject printing plate. The letter appears at the upper left and the lower right of each bill.
(b) Federal Reserve Bank Designation
The seal bears the name of the issuing Federal Reserve Bank, and the number of the bank appears to the left of the seal. The large letter in the center of the deal indicates the Federal Reserve District.
(c) Series Date
The date indicates the year the bill was redesigned. Minor revisions of a note's design are indicated with a letter following the date, e.g., 1969A, 1969B, or 1969D
(d) Serial Number
The serial number appears twice on each bill and includes a prefix letter and a suffix letter, except when a star is used instead of a suffix letter. A star indicates a replacement note - one that was part of a sheet used to replace a sheet that was removed due to errors or for test purposes.
(e) Treasury Seal
The seal of the U.S. Department of the Treasury, including the date of its inauguration, 1789
(f) Plate Serial Number
The small number after the lower right plate position letter is the serial number of the printing plate used to print the note.