Lot 40199 – Great Britain – 1840 Penny Black Official VR, an incomparable group

1840 Penny Black Official VR, an incomparable group of seven items, comprising five glass clichés (one with mirror image), all lettered PE, one in red and two in black with razor-sharp impression, also a black impression on transparent celluloid paper, and a faint grey impression on celluloid. The Penny Black official has not been mentioned in the literature on Sperati; this is a major discovery associated with this most iconic stamp of worldwide philately.