Any person aggrieved by any decision or order of the ⁶⁰ Appellate Tribunal may file an appeal to the High Court within sixty days from the date of communication of the decision or order of the ¹ [Appellate Tribunal] to him on any question of fact or law arising out of such order:
     Provided that the High Court may, if it is satisfied that the appellant was prevented by sufficient cause from filing the appeal within the said period, allow it to be filed within a further period not exceeding sixty days.