Great Britain 1840 1d black plate 1a pair on first day cover, SG2A world famous cover and one of the most important pieces of British philately. Great Britain 1840 (6th May) complete "Protestant Dissenters Assurance Company" insurance document sent from London to Stowmarket, Suffolk, franked with horizontal pair of 1840 1d black, plate 1a, lettered 'ID IF' used to pay the 2d postage rate for an item weighing in excess of oz but below 1oz, SG2. Cancelled by light red Maltese Crosses, handstamped with a London Chief