邮票传递情报屡试不爽。第一次世界大战期间,在南斯拉夫前线,有个专门收集邮票的人,他每到一处就给维也纳的人发一封信,对方也就寄些邮票作为回报。虽然此事曾引起南军方的注意,但未查出破绽,最后还是一位集邮专家从来往的信中找到了答案。原来那个人是谍报人员,他用一枚南非有战车的邮票表示骑兵 Stamps passing intelligence time-tested. During the First World War, on the front of Yugoslavia, there was a man dedicated to collecting stamps. He sent letters to people in Vienna each and every time. He also sent stamps in return. Although this incident has aroused the attention of the South military, it has not detected any flaws. Finally, a philatelic expert has found the answer from his letter. The original person is a spy officer, he used a South African tanker stamps that cavalry