Envelope, Gum-sealed, M-40, for message, US Army Signal Corps

Genuine WWII US Army Signal Corps M-1940 message gum-sealed envelope used in the field to send messages to the lines, Command Post, Headquarters... Used in the field and combat zone by Message Center, messenger dispatcher, code clerk, pigeon man, cryptographer, radioman... Used with Message Book M-210.

5-1/2″ by 3″.