Savings and loan associations, banks, insurance companies, and other corporations or other organizations, similar or dissimilar, are hereby authorized to lend, and to buy and sell for their own account, obligations in which except as to value of property and dignity of lien thereon securing the obligation it is otherwise lawful for such investor to invest its own funds, (by direct loan or by purchase), if the entire amount of the indebtedness is insured or guaranteed in any manner by the United States or by this State; or, if not so wholly insured or guaranteed, the difference between the entire amount of the indebtedness and that portion thereof insured or guaranteed by the United States or by this State, does not exceed the amount permissible under the law of this State, and meets the requirements thereof as to value of property and dignity of lien thereon, provided; further authorizing that any such lender may make an unsecured loan not exceeding Five Hundred Dollars ($500), if at least one-half thereof is guaranteed pursuant to the Servicemen’s Readjustment Act of 1944.