Romania: Airmail labels

Here are some old airmail labels from Romania.

Year: 1934, Gummed. Günter Mair's catalogue no: - ROM-A-7a, perforated 13 ½ , sheets of 8x1 pairs of
7a and 8a, grey-blue or blue/white, 3***

Year: 1940, Gummed. Günter Mair's catalogue no: - ROM-A-9, rouletted, sheets of 8x2 pairs of 
9 and 10 letterring modified (no serifs), light greenish grey-blue/white, 3***

Year: 1940, Gummed. Günter Mair's catalogue no: - ROM-A-10, rouletted, sheets of 8x2 pairs of 
9 and 10 letterring modified (no serifs), light greenish grey-blue/white, 3***