Each certificate issued by the Director-General shall be in the form of Annexure A: Provided that in relation to a tanker owned by the Government of the Republic and for the time being used for commercial purposes, the Director-General may issue a certificate adhering as closely as practicable to the said form and stating that such tanker is owned by the Government of the Republic and that any liability which may be incurred in connection with such tanker under Article III of the Convention or section 9(1) of the Act will be met by the Government of the Republic to the extent of the aggregate amount referred to in Article V of the Convention or section 9(5) of the Act.