Great Britain 1959 3d deep violet "Dollis Hill Phosphor Trial", SG575var
Great Britain 1959 3d deep violet "Dollis Hill Phosphor Trial", SG575var.
A very fine perforated bottom marginal block of four on gummed crowns watermarked (upright) paper, with a 4mm blue phosphor band printed over the ink between the two stamps, resulting in two stamps with a 2mm right band and two stamps with a 2mm left band.
A scarce exceptional quality piece of Queen Elizabeth II philately.
GB Specialised Catalogue No: ST7(3)b.
The Dollis Hill phosphor trials were made by the Post Office between 1958 and 1972. These trial stamps were unknown to collectors until they appeared on the market at a major London auction. These important trial stamps are now recognised as an area of fascinating philatelic study.
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