(a) Endorsement. The Commissioner shall indicate his insurance of the equity loan or acquisition loan by endorsing the original credit instrument and identifying the section of the Act and the regulations under which the loan is insured and the date of insurance.

(b) Endorsement of phased loan. In the event the loan is phased, the Commissioner shall indicate his insurance of each amount by endorsing the original credit instrument and identifying the section of the Act and the regulations under which such amount is insured and the date of the insurance.

(c) Final advance of phased loan. When all advances of a phased loan have been made and the terms and conditions of the commitment have been complied with to the satisfaction of the Commissioner, the Commissioner shall indicate on the original credit instrument the total of all advances the Commissioner has approved for insurance and again endorse such instrument.