South Africa SG14b 2d black and deep violet SHEET Post Due OVER-INKED at RIGHT

South Africa SG14b 2d black and deep violet Postage Due. 1923 2d black and deep violet sheet of 60 no lefthand selvedge plate 3 right pane (SG D14b var) showing over-inked frames at right unusual variety minor defects otherwise U/M Cat 960+++++