Band name.
Prior to the Federal Reserve system, the U.S. did have paper money, in the form of United States Notes, Silver Certificates, and Gold Certificates. The latter two were redeemable for their face value in the metal they reference, and secured by reserves of those metals. Gold certificates were withdrawn from circulation in 1933, and silver certificates in the 1960s.
The United States Notes were indebtedness undertaken by the government, secured partly by the credit of the country and partly by the precious metal reserves. I can recall $5 United States Notes and was aware that they were also issued in the $100 denomination.