GB 1959 SG575var Mint one blue band, Wmk. sideways paper
Stock Code: P11206079
1959 3d Deep violet “Dollis Hill Phosphor Trial“. Very fine perforated horizontal strip of three on gummed crowns watermarked (sideways left) paper, with one 4mm blue phosphor left side band printed over the ink. Scarce. Spec. ST7(3)f.
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