Great Britain 1872 1d black South Kensington Exhibition Proof Plate 27, SGDP36 Seychelles stamps The Mulready covers were issued

The Mulready covers were issued on the same day as the penny black (6th May 1840)

Much fresher than usually found

as well as two address books belonging to his wife

February and March

variety surcharge double

Great Britain 1872 1d black South Kensington Exhibition Proof Plate 27, SGDP36 Seychelles stamps The Mulready covers were issuedGreat Britain 1872 1d black South Kensington Exhibition Proof Plate 27, SGDP36. A superb unused left hand marginal horizontal pair lettered 'QA QB' with four large even margins. Superb appearance and an exceptional multiple of this exceptionally rare special proof production of the penny black. In February 1872 official permission was granted to the printers, Perkins Bacon for the production of printed proofs on thick white card, imperforate from Die