1894 envelope to Twickenham, England, bearing a 2d and a 1d, bisected and with a '½' overprint in black, to correctly pay the 2½d rate to England. The stamps have been individually cancelled by OPOBO OC 1 94 squared circle datestamps. On the back is a Twickenham NO 5 94 arrival c.d.s. A light vertical crease, well clear of the stamps and their cancellations, does not detract from this very rare cover. Only two examples of this provisional '½' overprint in black have been recorded on cover.