Section 198(1) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(1)A Senior Commissioned Officer may be promoted to the rank of Lieutenant and a Commissioned Officer (Branch List) to Senior Commissioned Officer, for gallantry in action or specially meritorious service in war before he would have become eligible by the preceding Regulations. On promotion, they shall, for all purposes, be treated in the same way as other officers of corresponding rank promoted in peace-time.