Great Britain Queen Elizabeth II 1959 3D Dollis Hill blue AOP, SG575var 1959 3d deep violet "Dollis Hill Phosphor Trail.
Very fine perforated block of four on gummed crowns watermarked (Sideways left) paper, with one 4mm blue phosphor left side band printed over the ink.
Scarce.
GB Specialised Catalogue No: ST7(3)f.
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