[Provided further that] the Appellate Tribunal may, in its discretion, refuse to admit an appeal in respect of an order referred to in clause (b) or clause (c) or clause (d) where

(i) in any disputed case, other than a case where the determination of any question having a relation to the rate of duty of excise or to the value of goods for purposes of assessment is in issue or is one of the points in issue, the difference in duty involved or the duty involved; or

(ii) the amount of fine or penalty determined by such order,