Persian Gulf. (India used in Aden). 1925. Official 'North West Railway ' envelope headed 'On His Majesty's Service', segmented for 'N.W.R. 1st Journey, 2nd Journey, 3rd Journey, 4th Journey', addressed to 'The First Assistant Resident, Aden' bearing India 'Service' SG 098, 1a brown tied by Maalla double ring '30th Sept' with Aden/ Dely on reverse and signed by the Postmaster bottom left on face.
Very rare item of Official Mail from this scarce office situated at the Headquarters of the single line Military Railways, the office closed on May 1st 1931.'