GIBRALTAR 1889 75c on 1s bistre, variety, SG21/aGibraltar 1889 75c on 1s bistre, upper left corner block of 8 (4x2) from right pane, R1 2 and R2 2 (second column of the setting) showing the variety, '5' with short foot, SG21 a. A stunning unmounted mint positional block with full original gum, (hinged in margin only). Two stamps (including one variety) with insignificant gum tones, which does not detract from overall fine and fresh appearance. A desirable and rare philatelic piece in this