Great Britain 1840 1d, Plate 1b, June 11th 1840 the earliest date of use SG2Great Britain 1840 1d, Plate 1b, June 11th 1840, the earliest date of use. PB 'original re entry' used on piece with "P JU 11 1840" London Chief Office Evening Duty circular datestamp. This is the earliest known date of use of this printing plate and, as such, is a very important historical piece in early GB postal history. The "Postage Stamps of Great Britain Part One" by J. B. Seymour & Gardiner Hill and the Stanley Gibbons volume 1 specialised