1955, Air Mail cover bearing two sets of old and new currency, "old paintings and Scientists of Ancient China", addressed to Czechoslovakia, tiny gum toned perfs and crease on top, mixed covers are very scarce
6; Übersee A-Z; CHINA - VOLKSREPUBLIK (PRC); Markenausgaben
6; Overseas A-Z; CHINA - VOLKSREPUBLIK (PRC); Stamp issues