If at any time the capital, by reason of the issue of preference shares, or otherwise, is divided into different classes of shares, all or any of the rights and privileges attached to each class may be modified with the consent in writing of the holders of at least three-fourths (3/4) of the nominal amount of the issued shares of that class, or by a resolution passed by a seventy-five per cent (75%) majority at an extraordinary meeting of the shareholders of shares of that class, and all the provisions hereinafter contained as to a general meeting shall mutatis mutandis apply to every such meeting, except that the quorum thereof shall be two members holding or representing by proxy at least one-third of the nominal amount of the issued shares of that class. This regulation does not by implication curtail the power to modify which the Bank would have if this regulation was omitted.