33. Where an assignment in respect of any goods of a trade mark which is at the time of the assignment used in a business in those goods, is made after the commencement of this Act otherwise than in connection with the goodwill of that business, the assignment shall not take effect unless the assignee, not later than the expiration of six months from the date on which the assignment is made or within such extended period, if any, as the Registrar may allow, applies to the Registrar for directions with respect to the advertisement of the assignment, and advertises it in such form and manner and within such period as the Registrar may direct.