GB 1959 SG575var Mint "Dollis Hill Phosphor Trial" two blue phosphor bands
Stock Code: P12310306
1959 3d Deep violet "Dollis Hill Phosphor Trial". Very fine perforated block of four on gummed crowns watermarked (upright) paper, with two 3mm blue phosphor bands printed over the ink. Spec. ST7(3)c.
£275.00
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