Aden. (Great Britain - Underpaid Mail). 1966. Envelope addressed to England bearing 'Churchill' Federation of South Arabia 10 fils green tied by Lahej double ring '12th Mars 66', underpaid with circular 'T' in blue of Lahej and circular 'T/ Centimes (30/ 10) in m/s, applied in Maalla with framed 'D 4/ To Pay/ Posted/ Underpaid' in turquoise applied on arrival with Hastings receiver '15th April' on reverse.