British Guiana. 1942. envelope addressed to Boston bearing British Guiana SG 293, 12c orange, SG 310, 4c scarlet and black, SG 311, 6c blue and SG 312, 24c green tied by air Mail/ British Guiana double ring with 'Officially Opened and Resealed/ By Censor' label tied by circular 'Passed by Censor/ 31' carmine on reverse. Attractive franking.