Great Britain 1959 3s Deep Violet "Dollis Hill Phosphor Trial", SG575var
Great Britain 1959 3s Deep Violet "Dollis Hill Phosphor Trial", SG575var.
Very fine perforated horizontal pair on gummed crowns watermarked (upright) paper, with a 4mm blue phosphor band printed over the ink between the two stamps, resulting in one stamp with a 2mm right band and a second with a 2mm left band.
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