Persian Gulf. (Aden). 1959. Registered Air Mail addressed to R.A.F. Khormaksar, Aden' bearing 'Revised Constitution' SG 74, 15c blue-green (strip of three) tied by oval 'Registered/ Little Aden P.O.' with matching 'R/ Little Aden' registration label and 'Air Mail/ from Hotel Pennsylvania' label on face. Very attractive item. Difficult stamps to find on cover.