Great Britain 1958 2d light red brown (crisp print) "Dollis Hill Phosphor Trial”, SG573var.
A very fine perforated block of four on gummed unwatermarked specially prepared handmade paper, with an all over green phosphor.
A scarce multiple.
GB Specialised Catalogue No: ST5(3)a.
Stanley Gibbons catalogue value: £1,200+.
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