This overprinted block from 1945 features a triple denomination revaluation applied during the turbulent post-war monetary reforms in China under the CNC (Central National Currency) system. The base stamp depicts Dr. Sun Yat-sen, engraved in matte reddish purple and originally valued at 3 cents. It was first surcharged to 400 dollars in black, and then overprinted again with a green and black CNC “2 dollars” inscription, marking a dramatic inflationary adjustment. The stamp was printed by the Chung Hwa Book Co. using gravure printing on ungummed paper, with a perforation of 12½, and measures 22 x 26 mm. These emergency fiscal issues were meant for everyday use during the economic chaos following the end of World War II, particularly during the struggle to stabilize the national currency and suppress the rising tide of hyperinflation. It is cataloged in all major philatelic references: Michel CN-IM 648, Scott CN-IM 620, Yvert et Tellier CN-IM 527, Stanley Gibbons CN-IM 779, and China Stamp Society CN-IM 985. As a historical artifact, the stamp embodies both the resilience of the Chinese postal system and the visual legacy of currency instability. Condition Mint never hinged block with sharp impressions, full CNC overprints, and balanced margins. Estimate "$45 – 60".