Description
Great Britain 1959 3d deep violet "Dollis Hill Phosphor Trial". Very fine perforated vertical block of eight on gummed crowns watermarked (upright) paper, with a 2mm blue phosphor centre band printed under the ink of the left hand column and no phosphor on the right hand column. Scarce. SG Specialised Catalogue Number: ST7(4)c, SG575var
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