Egypt: Airmail labels

Here are first airmail labels from Egypt.

Year: 1924, Gummed. Günter Mair's catalogue no: - EGY-A-1, perforated 10, sheets of 132(12x11), 
ref.: "(M.of C.P.O.No.25B)", futher day: 1929, several sheets come imperforated, dark blue or blue or
grey-blue/white, 4****

Year: 1931, Gummed. Günter Mair's catalogue no: - EGY-A-2a, perforated 10, sheets of 132(12x11) or
110(10x11), ref.: "(M.of C.P.O.No.25B)", blue or dark blue/white, 3***

Blue

Dark blue (Unlisted in catalog)

Year: 1931, Gummed. Günter Mair's catalogue no: - EGY-A-2b, perforated 12, sheets of 132(12x11),  
ref.: "(M.of C.P.O.No.25B)", blue or dark blue/white, 3***

Blue (printing blurred)

Light blue? (printing blurred)

Dark Blue