China Stamps - 1957 , A2 Sc C6-9, Air Mail Stamps 2nd Series, NGAI , F-VF - (900C6)

China Stamps - 1957 , A2 Sc C6-9, Air Mail Stamps 2nd Series, NGAI , F-VF (Free Shipping by Great Wall Bookstore) : After the founding of the People's Republic of China, traffic transport industry rapidly developed. To mark the progress, People's Posts of PRC issued the second set of aie mail stamps. The set of four stamps selected plane, bus,train and ship as the central design. There is a plane flying doted on the top of the right of the stamps which is considered as the symbol of air mail stamp.