Issued in 1949 during China's transitional inflation period, this mint never hinged block of six features the 50 cent surcharge on a blue 3 dollar tax stamp, repurposed for postal use. Printed in lithography without gum and measuring 27.5 x 25 mm, this issue reflects the widespread adaptation of fiscal stamps as definitives in response to economic instability. The design includes imagery of aircraft, locomotives, and passenger ships, symbolizing national modernization and mobility. Catalogued as Scott IM917, Michel CN-IM 1002, Yvert et Tellier CN-IM 751, Stanley Gibbons CN-IM 1144, and China Stamp Society CN-IM 1306, the block presents strong surcharge clarity and even margins. All stamps are in mint never hinged condition with excellent visual appeal. Estimate "$130 – 160"