一位邮友问了我一个看似简单的问题,“北京什么时候开始使用‘腰框戳’?”一下把我难住了。尽管我收集了大量的邮戳,知道新中国成立后,1957年才开始在北京陆续更换邮戳。但从哪个月、哪个邮局开始换戳,仍需考证。 A postal friend asked me a seemingly simple question, “When did Beijing start using ’waist frame stamp’?” Although I collected a large number of postmarkets, I realized that after the founding of new China, it was only in 1957 that Beijing began to change its postmark. However, from which month, which post office began to change stamps, still need to research.