India: Old airmail labels

Here is some of old Indian airmail labels.

Year: 1929, Gummed. Günter Mair's catalogue no: - IND-A-4a, rouletted (narrow steps), sheets of 
25(5x5), black-blue or dark blue or violet-grey-blue/white, 3***

Year: 1930, Gummed. Günter Mair's catalogue no: - IND-A-5, perforated 12, sheets of 25(5x5), 
"PAR AVION" : 27mm, blue or grey-blue or blue-grey/white, 4****