An employee shall be eligible to add to his service qualifying for superannuation pension (but not for any other class of pension) the actual period not exceeding one fourth of the length of his service or the actual period by which his age at the time of recruitment exceeded the upper age limit specified by the Bank for direct recruitment or a period of five years, whichever is less, if the service or post to which the employee is appointment is one-
(a) for which post-graduate research, or specialist qualification or experience in scientific, technological or professional fields, is essential; and
(b) to which candidates of age exceeding the upper age limit specified for direct recruitment are normally recruited;
(c) for which the candidate was given age relaxation over and above the maximum age limit fixed by the Bank on account of his possessing higher qualifications or experience;
provided that this concession shall not be admissible to an employee unless his actual qualifying service at the time he quits the service in the Bank is not less than ten years;
provided further that this concession shall be admissible if the recruitment rules in respect of the said service or post contain specific provision that the service or post is one which carries benefit of this regulation;
provided also that the recruitment rules in respect of any service or post which carries the benefit of this regulation shall be made with the approval of the Central Government.