Federal Reserve Banks, as Fiscal Agents of the United States, and the Treasury Department may issue full-paid interim certificates in lieu of definitive securities, against full-paid allotments of subscriptions, when specifically authorized by the Secretary of the Treasury in connection with the issue, hereafter, to the public, of United States securities. Interim certificates shall be in such form, and in such denominations, as the Secretary of the Treasury may determine when an issue is authorized.

Upon surrender of a full-paid interim certificate to a Federal Reserve Bank, or to the Treasury Department, Washington, DC 20226, the definitive securities described therein, when prepared, will be delivered. Exchanges shall be made on like par amount basis.

Pending availability of definitive securities, exchanges of authorized denominations of interim certificates, from higher to lower will be permitted.

Except as may otherwise be provided, and in so far as applicable, the general regulations of the Treasury Department, as contained in part 306 of this subchapter, as amended or revised, shall apply to full-paid interim certificates.

The Secretary of the Treasury reserves the right to withdraw or amend at any time or from time to time any or all of the provisions of this part.