United States. (United States Military - North African Mission). 1942. Stamp-less Air Mail envelope addressed to Pennsylvania cancelled by framed 'Censored/ No 20/ U.S.M.N.A.M.' in violet dated '30th Mag 1942' on face, endorsed 'Air Mail'.
Helbock notes the United States Military, North African Mission was created in September 1941 to aide the British and Russian Allies with military supplies and equipment.
(Helbock does not show an illustration or date). This is the fourth item recorded.