(1) Either of the Contracting Governments may, on the coming into force of the present Agreement or at any time thereafter while it continues in force, by a written notification of extension given to the other Contracting Government, declare its desire that the operation of the present Agreement shall extend, subject to such modification as may be necessary, to all or any of its colonies, overseas territories, protectorates, or territories in respect of which it exercises a mandate or trusteeship, which impose taxes substantially similar in character to those which are the subject of the present Agreement. The present Agreement shall, subject to such modifications (if any) as may be specified in the notification, apply to the territory or territories named in such notification on the date or dates specified in the notification (not being less than 60 days from the date of the notification) or, if no date is specified in respect of any such territory, on the sixtieth day after the date of the notification, unless prior to the date on which the Agreement would otherwise become applicable to a particular territory, the Contracting Government to whom notification is given shall have informed the other Contracting Government in writing that it does not accept the notification as to that territory. In the absence of such extension, the present Agreement shall not apply to any such territory.