Issued in April 1949 during the hyperinflationary final months of the Republic, this mint never hinged block of nine features the $1000 surcharge on a tax stamp design with inverted border pattern, repurposed for definitive postal use. Lithographically printed with variable perforation and no gum, the gray green stamps measure 26 x 23 mm and display transport themes including aircraft, locomotives, and passenger ships—emblems of national modernization. The inverted frame variety adds significant philatelic interest to this emergency issue. Catalogued as Scott IM940, Michel CN-IM 1013, Yvert et Tellier CN-IM 769, Stanley Gibbons CN-IM 1186, and China Stamp Society CN-IM 1341, the block is in excellent condition with full margins, strong impressions, and marginal markings visible at top. Estimate "$180 – 220"