Issued on February 1, 1949, this mint never hinged block of ten features the 50 cents surcharge on a brown 20 dollar tax stamp, repurposed for postal use during the Gold Yuan inflationary period. Printed lithographically with variable perforation and no gum, the stamps measure 26 x 23 mm and belong to the emergency definitives based on tax issues. This is Type I, distinguished by the thick numerals in the original "20" denomination. The design depicts multiple transport modes—aircraft, trains, and passenger ships—symbolizing national mobility and industrial ambition amid postwar instability. Catalogued as Scott IM913, Michel CN-IM 981, Stanley Gibbons CN-IM 1122, and China Stamp Society CN-IM 1304, this block exhibits full surcharge clarity despite generally poor perforation typical of the issue. Estimate "$180 – 220"