Lot 30428 – 1959 Wildings 3d deep violet “Dollis Hill Phosphor Trial” mint nh perforated top marginal block of four with a 4mm blue phosphor band printed over the ink between the two stamps

1959 Wildings 3d deep violet “Dollis Hill Phosphor Trial” mint nh perforated top marginal block of four on Crowns watermarked (upright) paper, with a 4mm blue phosphor band printed over the ink between the two stamps, resulting in two stamps with a 2mm right band and two stamps with a 2mm left band, very fine and scarce (SG Spec. ST7(3)b, £1’400+)