hi;The Japanese postal stationery has a Tokyo cancel.Check out this link;
http://www.sanrizuka.com/koban/lbA1-6.htmThe sudan stamps are Scott 11 ,3 Mills 1898
Scott 10 ,2 Mills 1898
or Scott 19, 3 Mills 1903-21
Scott 18, 2 Mills 1902-21
The two types depend on the Watermark..
Maybe someone can read the arab cancel to know exactly.
Are these entire covers? It would be nice to see the full cover.The destination can play an important part in the evaluation!
The China cover is either Scott 211 or 230 depending on the printing.I can't make out the details in this pic.