Lot 80323 – 1959 Wildings 3d deep violet “Dollis Hill Phosphor Trial” perforated bottom corner marginal block of nine

1959 Wildings 3d deep violet “Dollis Hill Phosphor Trial” perforated bottom corner marginal block of nine on gummed crowns watermarked (upright) paper, the first column without phosphor, the centre column with a 2mm blue phosphor band at left and the third column with a 2mm phosphor band at right that is misplaced to the right so that 95% of the band is in the sheet margin, most unusual and scarce (SG Spec. ST7(3)b, £3’150+).