GB 1959 SG575var Mint two blue bands, Wmk. sideways paper
Stock Code: P11206064
1959 3d Deep violet “Dollis Hill Phosphor Trial“. Very fine perforated block of four on gummed crowns watermarked (sideways left) paper, with two 3mm blue phosphor bands printed over the ink. Scarce. Spec. ST7(3)d.
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