South Africa 1926 Triangular Block, Missing Eyebrow

1926 4d grey-blue triangular, Afrikaans (SG 33a). Marginal M/UM BLOCK OF TWELVE imperforate with wide margins (from the sheet format issues of 16th April). Variety MISSING EYEBROW on top stamp of lower centre pair. Horizontal bend/crease - see scans. Nice multiple.