Great Britain 1878 10s greenish grey plate 1. A very fine unused original gum imperforate imprimatur lettered BB. Despite a small natural paper inclusion and light horizontal crease at top, the stamp is nevertheless very rare and one of only 24 possible examples with many not available as held in institutional collections. The stamp is accompanied with a 2011 British Philatelic Association (BPA) certificate of authenticity. The SG catalogue price is £28,000. SG128var.