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1941（17.7） Ordinary airmail cover from Huangyuan Tsinghai to Peking（6.8） and（7.8），bearing Thrift Movement 33c，correct postage，with censor seal label h.s. 4 green seals，obverse with airmail label，h.s.“Please Post by Air Mail”indication cachet，hand-written“Re-directed to Hopei”，a rare example showing 33c used on cover alone，plus VOP anti-bandit chop，thus making it a highly scarce natural envelope.