Aden. 1959. Registered Air Mail envelope addressed to England bearing SG 50, 10c orange, SG 52, 15c blue-green and 'Revised Constitution' SG 75, 1s25 blue and black (pair) on reverse tied by bilingual Shihr date stamp '29th Ap 59' with matching registered label with oval Registered/ Aden transit '4th May' on reverse.