Lot 392 Great Britain 1850 One Penny Prince Consort Essay, surface printed imperforate in black, with original gum and full margins all around, very fine and fresh with crisp impression. These were produced for Henry Archer, with letters FJ, believed to be the initials of Ferdinand Joubert, who designed Britain’s first surface printed postage stamp. A rare offering. SG Specialized #DP71, £4,500. Estimate $500.