Use old cheque book till June 30 2021. New Delhi: In a major relief to customers, Punjab National Bank (PNB) has announced that account holders who have accounts in Oriental Bank of Commerce (OBC) and United Bank of India (UNI) can continue to use old cheque book till June 30 2021 as the bank has extended the validity of cheque book till the said date. In effect, their old cheque book will become invalid from 1 July. Oriental Bank of Commerce and United Bank of India have been merged with Punjab National Bank, meaning that the checkbooks, passbooks, IFSC codes of these banks will have to be changed by a deadline fixed by the bank. PNB has said that e-OBC / e-UNI customers can take new PNB Check Book through the branch, Internet Banking Service, Mobile Banking Service and ATM. PNB has stated that the already issued check book of Oriental Bank of Commerce and United Bank of India (Post Dated Check Book) will be valid only till June 30, 2021.