What Is The Significance Of The Series Date On Our Currency?
Each time the design on our paper currency notes changes, a new series date appears on the face of the bill. This shows the year that the design change occurred. The series date on currency notes does not change each calendar year as it does on coins, but only when there is a major revision in the basic design. The capital letter following the series year shows that a minor design change was authorized in a particular series. Such a change occurs after the appointment of a new Secretary of the Treasury or Treasurer of the United States. At this time, the signature(s) found on the notes also change. A change in only one signature is a minor revision.