19.—(1) The application of the seal of the Authority shall be authenticated by the signature of the chair of the Authority or some other member authorised by the Authority to authenticate the application of the seal, and of the port manager or some person authorised by the Authority to act in his place in that behalf.
(2) The Authority may authorise a person to act instead of the port manager under this paragraph whether or not the port manager is absent or incapable of acting.