Lot 50054 – Great Britain – 1840 1d Penny Black Official VR, the incomparable group of four items

Great Britain – 1840 1d Penny Black Official VR, the incomparable group of four items comprising two negative glass clichés from a master negative, glass support cliché of the back impression numbered and registered at base “8/1” & “c.8”, as well as black impression on transparent celluloid. The Penny Black has never been mentioned in the literature dedicated to the work of Jean de Sperati, this being a major discovery associated to the most emblematic stamp of worldwide philately.