Proof 1840 1d. black, plate 1a, a horizontal pair lettered TA-TB, affixed to piece of laid paper, TA tied by superb clear strike of the red London "E/14 14/1840" c.d.s. and TB tied by fine strike of the black London "EX(?)/13 MY 13/1840" c.d.s., the piece inscribed "dated Stamp red composition" and "dated Stamp blk composition" denoting the cancellations; large margins, fine and extremely attractive. Photo