Lot 40200 – Great Britain – 1840 Penny Black Official VR, an outstanding group of ten glass clichés

1840 Penny Black Official VR, an outstanding group of ten glass clichés, all lettered PE, in a startling array of colours, including red, grey-blue, light grey, brown, three in negative, one is a true Sperati working cliché that includes manuscript notation about exposure, filter, chemicals, and temperature; the Penny Black VR official has not been mentioned in the literature on Sperati; this is a major discovery associated with the most iconic stamp of worldwide philately and this assembly of different exposures can never be replicated.