Great Britain 1902 1s dull green & carmine (Board of Education), SGO87The finest of the four examples of this great GB rarity Great Britain 1902 1s dull green & carmine (Board of Education), SGO87. The magnificent and unique unmounted mint, with full original gum, marginal example of this rare Government departmental issue and one of the great rarities of GB philately. There are only four examples believed to exist and this is considered the finest of those examples. A light gum bend is mentioned purely for accuracy and