Ceylon 1861-64 1d dull blue, SG28Ceylon 1861 64 1d dull blue, watermark large star, rough perforations 14 to 15, marginal block of 4 from left of sheet, showing re entry in "CEYLO" on lower right stamp, SG28. The re entry is a constant plate variety that shows portions of the design doubled over the other. It occurs in the same position on every sheet printed from the plate on which the re entry occurs. A fine quality mint block with large part original gum and brilliant colour.