1963 Yellow Seal Note

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A United States Note, also known as a Legal Tender Note, is a type of paper money that was issued from 1862 to 1971 in the U.S. Having been current for over 100 years, they were issued for longer than any other form of U.S. paper money. They were known popularly as "greenbacks" in their heyday, a name inherited from the Demand Notes that they replaced in 1862. Often called Legal Tender Notes, they were called United States Notes by the First Legal Tender Act, which authorized them as a form of fiat currency. During the 1860s the so-called second obligation on the reverse of the notes stated:[1]

This Note is Legal Tender for All Debts Public and Private Except Duties On Imports And Interest On The Public Debt; And Is Redeemable In Payment Of All Loans Made To The United States.

They were originally issued directly into circulation by the U.S. Treasury to pay expenses incurred by the Union during the American Civil War. Over the next century, the legislation governing these notes was modified many times and numerous versions were issued by the Treasury.

United States Notes that were issued in the large-size format, before 1929, differ dramatically in appearance when compared to modern American currency, but those issued in the small-size format, starting in 1929, are very similar to contemporary Federal Reserve Notes with the highly visible distinction of having red U.S. Treasury Seals and serial numbers in place of green ones.

Existing United States Notes remain valid currency in the United States; however, as no United States Notes have been issued since January 1971, they are increasingly rare in circulation.