The term qualified investments as used in section 28(b) of the Investment Company Act of 1940 shall include:
Any loan, any portion of which is guaranteed under Title III of the Servicemen's Readjustment Act of 1944, as amended, and which is secured by a first lien on real estate: Provided, The amount of the loan not so guaranteed does not exceed 662/3 percent of the reasonable value of such real estate as determined by proper appraisal made by an appraiser designated by the Administrator of Veterans' Affairs;
Any secondary loan the full amount of which is guaranteed under section 505(a) of Title III of the above mentioned act and which is secured by a second lien on real estate:
Loans made pursuant to this section shall be valued at the original principal amount of the loan less all payments made thereon which have been applied to the reduction of such principal amount.