在侦察涉及信件的犯罪案件中,为迅速查清问题,通常是首先弄清信件的投寄地点和时间。这样,不仅有助于确定侦察方向,缩小侦察范围,甚至可以直接发现作案人。弄清信件投寄的地点和时间,往往要从研究和识别信件上的邮戳入手。虽然邮戳上确有标明投寄地点和时间的文字和数字,但由于各种原因,印盖得不可能完整清晰,因此给识别工作造成一定困难。为此,我们走访了几家邮电业务部门,了解了有关规定,并且收集了近 In the detection of criminal cases involving letters, in order to quickly find out the problem, it is usually the first time to find out where and when the letter should be posted. In this way, not only help determine the direction of reconnaissance, narrow the scope of reconnaissance, and even direct detection of the perpetrator. To find out where and when to post the letter, it is often necessary to start with the postmark on the research and identification of the letter. Although there are indeed letters and numbers on the postmark indicating the place and time of posting, it is impossible for the seal to be complete and clear due to various reasons, thus causing some difficulties in the identification work. To this end, we visited several post and telecommunications business units, got to know the rules, and collected nearly