cover 1870 6c. on 1873 (Dec.) envelope (tear) to Hastings showing "DEFICIENT POSTAGE/FINE----------" h.s. completed for "4½" (deleted) and replaced by "6d", and 1873 3c. on 1874 envelope to Harbor Grace showing "MORE-TO-PAY" h.s. followed by h.s. "6"; an unusual pair