WASHINGTON - The Treasury sold $11 billion of 30-year bonds yesterday at an average yield of 6.33%, down from the 6.97% yield incurred in the previous sale on May 13, and the lowest since the Treasury began regular 30-year bond auctions in 1978.

The average coupon was 6 1/4%, down from 7 1/8%. The average price was 98.931.

The Treasury received $23.46 billion in bids for the bonds and accepted those in a range from 6.32% to 6.35%, including $390 million of noncompetitive bids at the average return. The Treasury accepted 10% of the bids at the highest return.

A total of $525 million was accepted at the average price from government accounts and Federal Reserve banks for their own account, in exchange for maturing securities. The additional notes were sold at the average price.

The bonds will mature Aug. 15, 2023.

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