Ever since the emergence of regular and predictable issuance of coupon-bearing Treasury debt in the 1970s, thirty years has marked the outer boundary of Treasury bond maturities. However, longer-term bonds were not unknown in earlier years. Seven such bonds, including one with a forty-year term, were issued between 1955 and 1963. This paper examines the circumstances that led to the issuance of these seven bonds.
Treasury debt management long-term bonds U.S. Treasury