He's talking about the notes not the bank itself. The notes were different then because of the gold and silver standard. People were using gold and silver. Not as much now that we have paper money and zinc coins.
After 1963, all notes were green seals and had "Federal Reserve Note" at the top. However, what makes THIS note a bit more valuable was the fact that Joseph Barr, Sec. of Treasury, held the position for just ONE month - Dec. '69 - Jan. '69 (yes, even though this is a "Series 1963" note, they don't change the Series every year).
Production of one-dollar Federal Reserve Notes was undertaken in late 1963 to replace the soon-to-be obsolete $1 Silver Certificate. The design on the reverse remained the same, but the border design on the obverse was completely redesigned and the serial numbers and treasury seal were printed in green ink. This was the first time the one-dollar bill was printed as a Federal Reserve Note."Wikipedia" I didnt know that about Barr.
In the lower right quadrant between the portrait of George Washington and signature of the Secretary of the Treasury is the Series Date. This number is presented as a the year portion of a date - as in 2004 - and sometimes has a letter suffix - as in 2004A. It is important to note that there is not a series for every calendar year. A new series will result from a change in the Secretary of the Treasury, the Treasurer of the United States, and/or a change to the note's appearance such as a new currency design. "www.onedollarbill.org"