Investments in obligations of reconstruction and development banks. A savings bank may invest not more than five percent of its assets in each of the following categories of investments

(1) In obligations issued or guaranteed by the International Bank for Reconstruction and Development.

(2) In obligations issued or guaranteed by the Inter-American Development Bank.

(3) In obligations issued or guaranteed by the Asian Development Bank.

(4) In obligations issued or guaranteed by the African Development Bank. [1959 c.185 §2; 1973 c.797 §378; 1985 c.456 §1]