India. (Aden). 1918. Stamp-less envelope with crest from the 'Malay State Guides' addressed to India endorsed 'On Active Service' cancelled by F.P.O./ No 392' date stamp with 'Passed Censor/ No A 147/ Aden' censor cachet in violet with circular 'Postal Censor/ Aden' applied by the Assistant Censor (Aden) and Bombay receiver on reverse. Very rare item from Field Post Office No 392 at Khormaksar.