Appeal to Supreme Court.
423. Any person aggrieved by any order of the Appellate Tribunal may file an appeal to the Supreme Court within sixty days from the date of receipt of the order of the Appellate Tribunal to him on any question of law arising out of such order:
Provided that the Supreme 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.
