(4)If there are more mortgages than one recorded in respect of the same sailing vessel or interest therein, the mortgages shall, notwithstanding any express, implied or constructive notice, have priority according to the date on which each mortgage is registered with the registrar and not according to the date of each mortgage itself:Provided that nothing contained in this sub-section shall affect the relative priorities as they existed immediately before the date on which this Part comes into force as between mortgages of the same vessel or interest therein effected before such date which are registered in accordance with the provisions of sub-section (2).
