1942, Belgian Congo, airmail envelope franked with (2x) 1fr, 6fr, 7fr, 10fr Palms 1942 issue and on reverse (5x) 5c sepia postage due stamps of the 1923 issue used as ordinary stamps, sent from Costermansville December 10, 1942 to Sault Saint Marie / Michigan / USA, via Leopoldville (Dec. 14), with manuscript note "par avion Clipper via Léo", rate of January 1, 1942 for cover to international 3,50fr for first 20gr + airmail to London via PAA 21,75fr/5gr, correctly franked at 25,25fr, with censor tape type Aa "CENSURE CONGO BELGE" applied at Costermansville by censor number "1" (in purple) and censor tape of Trinidad "OPENED EXAMINER - I.E. / 8018", very impressive cover, scarce
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