1945 AIRMAIL LONDON TO PORTO ALEGRE KGVI 2/6 YELLOW-GREEN (SG476b). Fine envelope sent airmail London to Porto Alegre, Brazil fine 2/6 yellow-green (SG476b) tied fine strike 'UNITED NATIONS' slogan 17 DEC 1945, on reverse 'PORTO ALEGRE' date stamp 27 XII 45. (ref 143556).
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