Aden. (Shihr & Mukalla). 1955. Registered Air Mail envelope addressed to France bearing Shihr & Makalla SG 20, 5c on 1a blue (pair), SG 21, 10c on 2a sepia, SG 23, 20c on 3a sepia and carmine and SG 24, 50c orange tied by bilingual Mukalla date stamp '16th Oct 54' with registered label, routed via Aden with instructional 'By Air Up To ...... Aden' in violet (struck twice) and Auxerre arrival. Scarce Air Mail instructional.