Lot# 8017

comprising two blue-black singles, two green singles and one green corner block of four. The blue-black shade represents a deeper colour variation of the normal blue printing, with strong inking and sharp impression, while the green examples are the famous colour error, believed to have resulted from accidental use of the wrong ink during the final Tainan printing period. All five examples retain sheet margins, printed from the outer positions of the plate with clearly visible layout characteristics. This group displays both blue-black and green colour variations, combining differences in shade, perforation, and plate position, and vividly illustrating the technical and printing distinctions of the Republic’s last postal issue. A well-preserved and comprehensive study of great philatelic and historical importance. Mizuhara "Huayou Jijin II" vol. 7, p.274.