1931. Registered envelope (small parts of flap missing) addressed to Tanganyika bearing Cote des Somalis Yvert 97, 1f olive and red and Yvert 98, 2f violet and black tied by Cote des Somalis/Djibouti double ring ‘15th July' with registered label and Dar-es-Salam receiver '31st Jy' with hand-struck 'Unclaimed' and framed instructional 'Undelivered For Reasons Stated/Return to Sender' and returned to Djibouti with dispatch 'Oct 2nd' and arrival '13th Oct' on reverse. Scarce instructional marks from East Africa.