Description
Great Britain Queen Elizabeth II 1959 3d deep violet "Dollis Hill Phosphor Trial". A very fine perforated top marginal block of six on gummed crowns watermarked (upright) paper with a 4mm blue phosphor band printed over the ink between the two stamps, resulting in three stamps with a 2mm right band and three stamps with a 2mm left band. A scarce piece. GB Specialised catalogue number: ST7(3)b SG575var.