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SUDAN - OFFICIALS 1902. MINT SPECIALIZED COLLECTION on six, Exhibition sleeved pages of the 1m brown & pink 'Arab Postman' opt'd 'O.S.G.S.', SG O3/3a/3b & varieties. Includes a reconstructed (as overprinted at Kartoum) PANE OF THIRTY stamps with 'Oval O' (SG O3a) variety (stamp no 19) and lower row of 6 stamps (nos. 25 to 30) with 'Round Stops' (SG O3b), a quad of extreme overprint shifts, two stamps bearing inverted overprints, one with round stops (SG O3c & SG O3e - these Cat £1250), a block of four containing another 'Oval O', half a dozen examples of Specialized minor constant varieties and a three page reference key to the collection, also in sleeved pages. A fascinating collection (46 stamps)