The additional liability imposed upon shareholders in national banking associations by the provisions of sections 63 and 64 of this title shall not apply with respect to shares in any such association issued after June 16, 1933. Such additional liability shall cease on July 1, 1937, with respect to all shares issued by any association which shall be transacting the business of banking on July 1, 1937: Provided, That not less than six months prior to such date, such association shall have caused notice of such prospective termination of liability to be published in a newspaper published in the city, town, or county in which such association is located, and if no newspaper is published in such city, town, or county, then in a newspaper of general circulation therein. If the association fail ¹ to give such notice as and when above provided, a termination of such additional liability may thereafter be accomplished as of the date six month ² subsequent to publication, in the manner above provided. In the case of each association which has not caused notice of such prospective termination of liability to be published prior to May 18, 1953, the Comptroller of the Currency shall cause such notice to be published in the manner provided in this section, and on the date six months subsequent to such publication by the Comptroller of the Currency such additional liability shall cease.