Sudan. (Portuguese Colonies - Angola). 1900. Sudan postal stationery envelope 'One Piastre' blue cancelled by Sawakin date date stamp '5th Aug 00' addressed to 'Dr Bertha Wehlin, Mossamedes, Angola, West Africa, endorsed 'via Lisbonne, Zanzibar, Mauritius and British East Africa' with Suez and Lisboa transits '24th Aout' on reverse.