This is a cover I just picked up with a K-3 censor mark. This is something new I am collecting censored post ww2 U.S. Embassy and diplomatic mail.
The cover is posted from the U.S. Embassy in Beirut to the U.S. consulate in Pakistan. Can anyone tell me 1. Why the use of a U.S. forces APO number and 2. anything about the K-3 censor mark as i have not come across it before.