Sudan 1936-46 1m black and orange Official error, SG032aSudan 1936 46 1m black and orange Official, error OVERPRINT DOUBLE, SG032a. A fine used block of 4, centrally cancelled by very light but identifiable 'Wadi Medani' circular date stamp. An extremely rare block. Just 53 examples (from one sheet) of this previously unknown King George VI error were discovered in 1980. The Camel Postman stamps of Sudan are considered by the famous printers De La Rue as the most satisfactory in their long history of stamp