Issued between 1932 and 1937, the complete "Plane over the Great Wall" airmail series from the Republic of China is among the most iconic and visually striking philatelic issues of the pre-war period. Designed and printed by the Chinese Bureau of Engraving and Printing, the series features a dynamic image of a monoplane soaring above the winding expanse of the Great Wall, a powerful symbol of China's ancient history meeting modern aviation. The stamps are engraved and measure 43 x 25 mm, with line perforation 14 and inscriptions in traditional Chinese script. Each value is rendered in a distinct color, ranging from the lowest denomination of 15 cents in green to the high value of 5 dollars in deep carmine, with intermediate values including 25c orange, 30c red-orange, 45c violet, 50c red-brown, 60c blue, 90c olive-black, $1 light green, and $2 dark brown. These stamps were used to prepay airmail postage during a period of rapid expansion of civil aviation in China and were a vital component of the modernization of the national postal network. Their consistent imagery and finely engraved details reflect both national pride and technological aspiration. Catalogued as Michel CN-IM 262–271, Scott C11–C20, Yvert PA11–PA20, Stanley Gibbons CN-IM 422–431, and China Stamp Society AM15–AM28, this series remains one of the most sought-after classic airmail sets. The presented set is post office fresh, unused with original gum, though some examples show light hinge marks and pencil annotations on reverse. As a complete series, it is not only aesthetically cohesive but also historically resonant, marking a critical intersection between heritage and progress in Republican-era China. Estimate "$250 – 380"