Section 29(1) in The Post Office Savings Certificates Rules, 1960
(1)At any time after the period of its non-encashability, certificate of higher denomination than Rs.10 may be discharged in part such part being Rs. 10 or a multiple thereof.Provided that in respect of a7-Year National Savings Certificates (III Issue) a certificate of higher denomination Rs. 100 may be discharged in part at any time after the period of its non-encashability such part being Rs. 100 or a multiple thereof.
