Great Britain 1840 2d Mulready letter sheet, Stereo A92, SGME3Great Britain 1840 2d Mulready letter sheet, Stereo A92 used with pair of 1d blacks, plate 1b, SG2. An exceptional example of the first printings of the penny black, plate 1, used to uprate the 2d Mulready letter sheet to four pence for weight up to 2 oz. A very interesting and exceptionally rare piece with the addition of PB PC pair of penny blacks in the grey black shade showing considerable wear of the printing plate, which is normally associated