The stock of every corporation, incorporated under this act, shall be represented by certificates signed by the president or vice-president, and the secretary or an assistant secretary, or the treasurer or an assistant treasurer. The certificate shall be sealed with the seal of the corporation. When a certificate is signed by a transfer agent or a transfer clerk and by a registrar, the signature of the corporate officers and the seal thereon may be facsimiles, written, engraved, stamped, lithographed, or printed. If an officer who has signed or whose facsimile signature has been placed upon a certificate has ceased to be an officer before the certificate is issued, it may be issued by the company with the same effect as if the officer had not ceased to be an officer at the date of its issue.