"broken tail") imprint strips of three (2) and singles (15, one showing comma between "I" and "R" in "AIR"; generally fine mint. S.G. 116-117, £488" /> Air Mail unused Harrison 6d. block of ten from the top of sheet showing double row of perfs at top, blocks of four (2, one showing "POSTACE" at left), imprint strips of three (2), pairs (3, one showing "POSTACE" at left) and singles (14), and 1/- blocks of four (2, one showing<I> "broken tail"</I>) imprint strips of three (2) and singles (15, one showing comma between "I" and "R" in "AIR"; generally fine mint. S.G. 116-117, £488 | Christie's