Federal Reserve Bank Note
Federal Reserve Bank Notes are legal tender banknotes in the United States that were issued between 1915 and 1934, together with United States Notes, Silver Certificates, Gold Certificates, National Bank Notes and Federal Reserve Notes. They were specified in the Federal Reserve Act of 1913 and had the same value as other kinds of notes of the same denomination.
Source: Wikipedia — Federal Reserve Bank Note (CC BY-SA 4.0)