The number of member directorships designated as representing the members located in each separate State in a bank district shall be determined by the Director in the approximate ratio of the percentage of the required stock, as determined pursuant to regulation of the Director, of the members located in that State at the end of the calendar year next preceding the date of the election to the total required stock, as so determined, of all members of such bank at the end of such year, except that in the case of each State such number shall not be less than one and shall not be more than six. Notwithstanding any other provision of this section, (A) except as provided in clause (B) of this sentence, if at any time the number of member directorships so designated as representing the members located in any State would not be at least equal to the total number of elective directorships which, on December 31, 1960 , were filled by officers or directors of members whose principal places of business were located in such State, the Director shall add to the board of directors of the bank of the district in which such State is located such number of member directorships, and shall so designate the directorship or directorships thus added, that the number of member directorships designated as representing the members located in such State will equal said total number, and (B) clause (A) of this sentence shall not apply to the directorships of any Federal Home Loan Bank resulting from the merger of any 2 or more such Banks. Any member directorship so added shall exist only until the expiration of its first term. The Director shall, with respect to each member of a Federal home loan bank, designate the State in the district of such bank in which such member shall, for the purposes of this subsection and subsection (b) of this section, be deemed to be located, and may from time to time change any such designation, but if the principal place of business of any such member is located in a State of such district it shall be the duty of the Director to designate such State as the State in which such member shall, for said purposes, be deemed to be located. As used in the second sentence of this subsection, the term “total number of elective directorships” means the total number of elective directorships on the board of directors of the bank of the district in which such State was located on December 31, 1960 , and the term “members” where used for the second time in such sentence means members of such bank.