Great Britain 1885 £1 brown lilac I.R. Official Specimen, SGO11sGreat Britain 1885 1 brown lilac (I. R. Official, Watermark Three Crowns) Specimen, SGO11s. A very fine unused, with original gum, example overprinted "SPECIMEN" type 11. Lovely colour. A scarce Government Official Specimen example. The Inland Revenue Official stamps were used by revenue officials in the provinces, mail to and from Head Office passing without a stamp. The London Office used these stamps only for foreign mail. Order online, by phone