Issued from 1863-1865 during the U.S. Civil War, Interest-Bearing Notes, as their name suggests, were a group of Treasury Notes that bore interest at a rate of five percent for a period of one or two years. The group often also includes Treasury Notes that matured in either sixty days or two years at an interest rate of six percent, and a collection of Treasury Notes known as seven-thirties that matured in three years at an interest rate of 7.3 percent.