Notwithstanding anything contained in any other provision of this Act, the master of a ship registered at a port outside India who has an agreement with the crew made in due form according to the law of that port or of the port in which her crew were engaged, may engage in any port in India-

(a) a seaman who is not a citizen of India and who holds a continuous discharge certificate or any other similar document of identity issued by the competent authority of the country in which the ship is registered or, as the case may be, of the country in which the said agreement was made; or

(b) a seaman who is a citizen of India and who holds a certificate of discharge or a continuous certificate of discharge issued under this Act, and any seaman so engaged under clause (a) or clause (b) may sign the agreement aforesaid and it shall not be necessary for him to sign an agreement under this Act.]