Switzerland: Airmail labels 3

Here is a set of old and rare airmail labels from Switzerland.

Year: 5.1924, Gummed. Günter Mair's catalogue no: - SWI-A-2c, perforated H 11, V strips of 10,
ref.: "No.532.M.S.L. V.24.20,000.", black/light blue-grey, 4****

Year: 12.1924, Gummed. Günter Mair's catalogue no: - SWI-A-3, perforated H 11, V strips of 15, 
ref.: "Nr.532.XII.24.Format A9/2 (18x52), black/blue, 4****

Year: 12.1924, Gummed. Günter Mair's catalogue no: - SWI-A-4, perforated H 11 ½ , V strips of 5, 
ref.: "Nr.532.XII.24.Format A9 (37x52), intended for use on parcels, black/blue, 5*****

Year: 1.1926, Gummed. Günter Mair's catalogue no: - SWI-A-5, perforated H 11 ½ , V strips of 5,  ref.: "Nr.532-1.26.40,000 à 10. Format D9/2 (17x48).", black/grey-blue, 4****

Year: 9.1933, Gummed. Günter Mair's catalogue no: - SWI-A-18, rouletted H (black lines) , 
V strips of 5, ref.: "No.532.-IX.33.80,000x10.Format D 9/2 (17x48).", further date: 9.1935 
(150,000), black/grey-blue or greenish grey-blue, 4****

grey-blue

greenish grey-blue

Year: 3.1937, Gummed. Günter Mair's catalogue no: - SWI-A-20, rouletted H, V strips of 10 (200,000) or booklets with 2 V strips of 5 (150,000), ref.: "No.532.-III.37.200,000x10.
Format D 9/2 (17x48).", some V strips of 10 come with wrong date: III.27, dark blue/white, 3***

Year: 5.1938, Gummed. Günter Mair's catalogue no: - SWI-A-23, rouletted H, V strips of 10, 
ref.: "No.532.-V.38.300,000x10.Format D 9/2 (17x48).", further dates: 4.1939(400,000); 5.1942
(400,000), dark blue/white, 3***