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东北解放区邮政,曾在1948年8月1日和1949年 6月,先后使用了两种免资信封,分别供参加全国第六次劳动大会和东北人民代表会议与会者寄信用,其免费标志就是两种信封上的免资戳,上有“免费邮件”四字。这
The postal service of the Liberated Areas of Northeast China used two kinds of free envelope in succession on August 1, 1948 and June 1949 respectively to send letters to participants attending the 6th Labor Meeting and the Northeast People’s Congress. The free sign is The two kinds of envelope free stamp, there is “free e-mail” word. This