Tonga 1893 ½d on 1d ultramarine Official, O6Tonga 1893 (Dec) d on 1d ultramarine Official, block of 8 (4x2) from upper right corner of left pane showing four applications of the vertical two unit handstamp, SGO6. A fine mint positional block with original gum. Despite small imperfections (slight gum creasing, second stamp in lower row with small thin at foot), it remains a rare positional multiple of fine appearance and much above average condition for this Official stamp rarely seen without