Rule 6(b)(i) of Rules of 1975. Since the comparable price is more than the price at which the goods were stock transferred by the appellant to their other units, the Department had confirmed the differential duty liability on the appellants. The Order-in-Original dated 31.03.2017, confirming the adjudged demand on the appellants was challenged by way of filing the appeal before the learned Commissioner (Appeals), Central Excise, Nashik. Vide the impugned order dated 21.03.2018, learned Commissioner (Appeals) has upheld confirmation of the adjudged demand and rejected the appeal filed by the appellants. Feeling aggrieved with the impugned order dated 21.03.2018, the appellants have preferred this appeal before the Tribunal. The appellants have assailed the impugned order mainly on the ground that the show-cause proceedings are barred by limitation of time, inasmuch as on the basis of periodic price list filed by them, the showcause notice was issued, which is beyond the normal period of one year from the relevant date and that the extended period of limitation cannot be invoked for such initiation of proceedings