Department circulars, public debt series. 2-64. United States of America 4ΒΌ percent Treasury bonds of 1975-85, dated Apr. 5, 1960, with interest from Jan. 22, 1964, due May 15, 1985, redeemable at option of United States at par and accrued interest on and after May 15, 1975, interest payable May 15, and Nov. 15.