1944 MAIL TANGIER TO PORTO ALEGRE, BRAZIL WITH U.K. 2/6 YELLOW-GREEN (SG476b) ALSO 9d AND 1s. Envelope, tone spots sent 'Via Aerea Clipper' from Tangier to Porto Alegre, Brazil with un-overprinted U.K. 2/6 yellow-green (SG476b), 9d deep olive-green (SG473) and 1s bistre-brown (SG475) cancelled good to fine strikes 'BRITISH POST OFFICE/TANGIER' date stamps 17 AP 44. At left Censor label and on reverse 'PORTO ALEGRE' date stamp 20 V 44. (Ref 143444).
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