1891 (OC 9) registered cover to Scotland bearing the two errors of surcharge 6c. on 10c. on 4d. with inverted ‘6’ and bar (SG 43a) plus 6c on 10c. on 4d. black surcharge with inverted ‘6’ and bar (SG 44a), cancelled with obliterator, cds to left, reverse with unusual Belfast transit and arrival cds. B.P.A. Certificate (1964). Remarkable.