1880-81 Provisional Issue and 1881 1d Lilac. 1880-81 2d in pale green on imperforate white paper affixed to small piece of white card (35x76mm), tied by an experimental London E.C. squared circle trial cancellation, ms "2 1/2" below, minor foxing, very rare. (Image)

1880 5d Indigo pl.1 imperforate imprimatur, mint o.g., good balanced margins, very rare with only 24 possible examples. (Image)

1881 1d lilac die II (16 dots) with experimental Portsmouth squared circle trial cancellation (Ja. 5.1885), produced for the 1884 Stamp Committee, very fine and rare. See S.G. Specialised Vol 1 Catalogue p.345. (Image)

1881, 1d deep purple die II, wmk inverted, from the foot of the sheet showing variety printed on the gummed side, fine mint n.h.; cert RPS (1980). (Image)