Italian Colonies: Airmail labels

Here are some labels from Italian Colonies in Africa.

Year: 1934, Gummed. Günter Mair's catalogue no: - ITC-A-1b, perforated 12, sheets of 20(2x10),
ref.: "Mod 24-R bis", blue or dark blue/white, 3***

Year: approx.1940, Gummed. Günter Mair's catalogue no: - ITC-A-5, perforated 11, sheets, "PER VIA
Aerea": 29.5mm, issued for Italian East Africa, black/grey-blue/white, 4****

Year: 1933, Ungummed. Günter Mair's catalogue no: - ITC-C-1, imperforated, vertical strips of 8 with 1
pair tête-bêche, ref.: "I-33-XI.", issued for Italian Somaliland, black/pink, 5*****