GB 1958 SG573var Trial “Dollis Hill Phosphor Trial“
Stock Code: P11205178
1958 2d Light red brown “Dollis Hill Phosphor Trial“. Very fine perforated left hand marginal block of six on gummed crowns watermarked (upright) paper, with a single green phosphor band at left. Although similar to the issued stamp (SG 613), the colour is much paler, the printing courser and the phosphor reaction afterglow much stronger. The phosphor band is printed by photogravure and clearly visible in normal light on both the front and reverse. Spec. ST5(5)c.
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