GB 1958 SG573var Mint all over green phosphor, unwatermarked paper
Stock Code: P11205191
1958 2d Red brown “Dollis Hill Phosphor Trial“. Very fine perforated block of four on ungummed unwatermarked specially prepared hand made paper, with all over green phosphor showing a strong phosphor reaction. Scarce. Spec. ST4(3)a.
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