GB 1958 SG573var Mint "Dollis Hill Phosphor Trial" all over yellow phosphor
Stock Code: P11205142
1958 2d Light red brown "Dollis Hill Phosphor Trial". Very fine perforated example on gummed unwatermarked specially prepared handmade paper, with an all over yellow phosphor showing a strong phosphor responce. Experiments with yellow phosphor were short lived due to fears of toxicity of the phosphor ink. Very scarce. Spec. ST5(5).
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