Except as otherwise provided under AS 10.06.349, the shares of a corporation shall be represented by certificates signed by the president or vice-president and the secretary or an assistant secretary of the corporation, and may be sealed with the seal of the corporation or a facsimile of the seal. The signatures of the president or vice-president and the secretary or assistant secretary upon a certificate may be facsimiles if the certificate is countersigned by a transfer agent or registered by a registrar, other than the corporation itself or an employee of the corporation. If an officer who has signed or whose facsimile signature has been placed on the certificate ceases to be an officer before the certificate is issued, the certificate may be issued by the corporation with the same effect as if the officer were an officer at the date of its issue.