Heinrich Köhler 384 Auction – Day 1 Single Lots: Europe and Colonies, Kingdom of Lombardy–Venetia – The "P.G." Collection

10 k. brown/blue imperforate, Plate I with error “Dot Between 10 and KOP”, fresh colours and good embossing, slightly touch at lower right, close at right otherwise good margins, still fine, an extremely scarce variety originating from a rejected die proof, certificate Citerne BPP (2024)