Italy: A.E.I. (Aero Espresso Italiane)

Here are an airline issue labels from Italy. A.E.I.  ( Aero Expresso Italiane ). The labels were issued for customers in Greece.

Year:  12.12.1933, Gummed. Günter Mair's catalogue no: - ITA-B-4, perforation 11 1/2, sheets of 20(2x10)
or 10(2x5), dark blue or blue/white, 4****

Year: 1932, Gummed. Günter Mair's catalogue no: - ITA-B-5, perforated 11 ¼ , sheets of 20(2x10),
blue/white, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - ITA-B-6a, perforated 11 ¼ , sheets of 20(2x10),
lettering modified, blue/white, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - ITA-B-6b, perforated 11, sheets, dark violet-blue/white
4****