Egypt: Airmail labels 2

Here are some rare unofficial airmail labels from Egypt.

Year: 1927, Ungummed. Günter Mair's catalogue no: - EGY-C-1, imperforated, black/light blue, 6******

Year: 1937, Gummed. Günter Mair's catalogue no: - EGY-C-2, perforated H 11 ¼  V 11, sheets, 
embossing, dark blue/white, 5*****

Year: 1952, Gummed. Günter Mair's catalogue no: - EGY-C-8, perforated 11 ¼, sheets, dark blue/white,
4****