Seven-Thirties Three year Treasury Notes bearing interest at a rate of 7.30% (seven-thirty) were first authorized by the Act of July 17, 1861 to help finance the Civil War. These notes are payable to order, but the Treasury would issue them in blank form if requested. Secretary of the Treasury Chase suggested this rate of interest in hopes that the ease of interest calculation (a $50 note would accrue interest at one cent per day) would give the notes an opportunity to circulate as money, but apparently this did not prove to be the case. Further issues of Seven-Thirties were made in 1864 and 1865. The issue of 1861, which preceded the First Legal Tender Act, paid interest in gold, but the government reserved the right to pay the interest of the 1864 and 1865 issues in either United States Notes or gold. (Source: Goldologist)
Comparison of a $5 Demand Note (upper image) and an 1862 issue $5 United States Note (lower image). Note the removal of the words “On Demand” and of the phrase “Receivable in Payment of All Public Dues”. Also note the Treasury Seal added to the United States Note.
The Supreme Court under Chief Justice Samuel P. Chase. The Chase court presided over many important decisions during Radical Reconstruction following the Civil War. (Source)