Section 121, The Companies Act, 2009

Each share in a company having a share capital shall bedistinguished by its appropriate number; but if at any time all the issued shares in a company, or all of its issued shares of a particular class, are fully paid up and rank pari passu for all purposes, none of those shares need thereafter have a distinguishing number so long as it remains fully paid up and ranks pari passu for all purposes with all shares of the same class for the time being issued and fully paid Share certificates