Iowa Code § 491.48: Stock certificates — signing.

A corporation organized and existing under the laws, either general or special, of this state, may designate in its articles or bylaws the officer or officers who shall be empowered to sign stock certificates issued by the corporation. If the articles or bylaws provide for the signature of a registrar or the signature or countersignature of a transfer agent on stock certificates issued by it, the corporation may likewise provide in the articles or bylaws that in lieu of the actual signature of the officer or officers authorized to sign stock certificates, the facsimile thereof may be either engraved or printed thereon.