Aden: 1961-66 five stampless Official envelopes with 1966 cover to UK with Field Post Office 218 cds, red BY AIRMAIL/ CERTIFIED OFFICIAL oversigned handstamp, OHMS Aden G.P.O. cds stampless envelope used within Aden, 1961 Economy Label stampless airmail envelope from Comman Pay Office, similar cover without the economy label and 1961 Field Post Office 1056 airmail to hounslow.
