Section 31C in The Post Office Savings Certificates Rules, 1960
31C. Interest.
(1)Interest on 7-year National Savings Certificates (III Issue) issued prior to the 23rd July, 1974 shall be payable annually at 5% upto the 23rd July, 1974 and at 6 per cent from the 23rd July, 1974.(2)Interest on 7-Year National Savings Certificates (III Issue) issued prior to the 23rd July, 1974 shall be payable annually at 6 per cent.
