按中国人民邮政业务规定:用邮人所寄信件,投至收件人单位后,如无收件人,邮政部门应按寄出地址退回。这里介绍一件新中国早期无法投递的平信作退回处理之后的实寄封。该退回的实寄封为薄牛皮纸,中式红框式封。1951年6月13日寄出,地址为“山西宁武县第四区叠台寺”;收件人是“西北人民医院/王二伦先生收启”。 According to the provisions of the Chinese people’s postal services: postal mail sent by mail, cast to the recipient unit, if there is no recipient, the postal service shall be returned by mail address. Here is a postal report about the unbelievable delivery of Binhai in early New China. The return of the actual seal for the thin kraft paper, Chinese red box seal. June 13, 1951, address is “Mount Tai County, Shanxi Province fourth Temple District”; recipient is “Northwest People’s Hospital / Mr. Wang Erlun closing.”