essay 1840 (January) proof from an experimental plate made for comparison of the two backgrounds and as a trial in spacing: two rows, each of five impressions in blue, the top row showing the rejected die inscribed at foot "POSTAGE ONE PENNY", the lower row the background for the accepted die, the whole printed on a single sheet of paper; tear at right just encroaches into design of the top right impression. S.G. Spec. DP11. Photo in colour