Sudan: Airmail labels 2

Here a couple more old labels from Sudan.

Year: 1931, Gummed. Günter Mair's catalogue no: - SUD-A-3, perforated H 14, booklets with 
vertical strips of 2 labels + stamps, dark grey-blue/white, 4****

Year: 12.1935. Gummed. Günter Mair's catalogue no: - SUD-A-4a, rouletted, sheets of 50(5x10)
black/light blue/white, 4****