This is an original censored WWII Army Cover(envelope) dated April 7, 1945 and is franked with stamp #UC5 "Air Mail". The envelop was sent by Walter P. Johnson to his wife Paige Johnson of Brawley, California. Nevertheless the envelope contains nothing.
The address the envelope was sent from was APO #83. Which according to "Geographic Locations of U.S. APO's 1941-1978" by James Shaffer, was in Buttgen, Germany on this date.
