33 (41a) 1888-91 4d on 2' orange Q Victoria revenue stamp, wmkd Small Star, perf 14, surcharged "4d POSTAGE" (SG Type 16), VARIETY - upright "d" (row 5, pos 6), rare as it occurred only once in each pane of 60 (of SG 41), a very difficult stamp, quite undercatalogued.
