Luxembourg. (French Morocco). 1939. Air Mail envelope addressed to Oujda, French Maroc bearing Luxembourg Air Mail Yvert 6, 3f grey tied by Luxembourg Ville date stamp '27th Dec 1939' with 'Par Avion/ Durch Flugpost' label in blue with 'Controle Postal Militaire' censor label tied by oval 'Ouvert/ Par L' Autorite Militaire/ WX 462' and circular 'Controle Postal/ Commission 0' in red on face, underpaid with hand-struck 'T' 13 1/2 endorsed 'Insuffisannant Affanchisment' and bearing French Maroc postage dues Yvert 29, 10c brown, Yvert 31, 10c carmine (2) and Yvert 54,2f violet applied and tied by Oujda/ Maroc receiver. Lovely item of underpaid Air Post from Luxembourg.