Need to ask about a lot?

SUDAN - OFFICIALS POSTMARK COLLECTION. 1903-1912 Star & Crescent Wmk 'O.S.G.S.' overprinted selection of various values, part of an Exhibition collection, presented neatly on sleeved pages with each postmark being partially or completely identified and placed in mounts on typed pages, alphabetical range from Atbara to White Nile, plus Paquebot, Telegraph and a selection of small pieces bearing 'SG' punctured & opt'd combinations. Interesting collection (60+ stamps)