1915-18 a pair of cover from Harbin to Europe via America. The trans-Siberia route Being disrupted by 1917 Revolution and Civil War, mail
1915-18 a pair of cover from Harbin to Europe via America. The trans-Siberia route Being disrupted by 1917 Revolution and Civil War, mail were re-routed via America. The 1918 took the southerly route via Mukden, while the 1918 registered cover was transited via New York and London and censored.1918-20，两件哈尔滨经美国寄欧洲信件，貼帆船票，由于俄国革命与内战关系，西伯利亚铁路中断，改行美国，1915年一件寄英国，南下奉天，1918年一件挂号寄丹麦，经纽约、伦敦中转，并受检查。
