12. Seniority of members of Service.

(a) a member appointed by direct recruitment shall be senior to a member appointed by promotion or transfer;
(b) a member appointed by promotion shall be senior to a member appointed by transfer;
(c) in the case of member appointed by promotion or by transfer, seniority shall be determined according to the seniority of such members in the appointments from which they were promoted or transferred; and
(d) in the case of members appointed by transfer from different cadres, their seniority shall be determined according to pay, preference being given to a member who was drawing in higher rate of pay in his previous appointment and if the rates of pay drawn are also the same, then by their length of service in those appointments and if the length of such service is also the same, an older member shall be senior to a younger member.