Luxembourg: Airmail labels 2

Here are some old and new labels from Luxembourg.

Year: 1937, Gummed. Günter Mair's catalogue no: - LUX-A-6, imperforated, vertical strips of 4,
black/blue, 4****

Year: 1939, Gummed. Günter Mair's catalogue no: - LUX-A-7, imperforated or rouletted, vertical strips of 4, black/blue, 4****

Year: approx.1960, Gummed. Günter Mair's catalogue no: - LUX-A-12, perforated 10 ¾ , sheets,
black/light blue, 2**

Year: approx.1965, Gummed. Günter Mair's catalogue no: - LUX-A-13, perforated 10 ½ , sheets,
black/light blue, 2**

Year: before 1982, Gummed. Günter Mair's catalogue no: - LUX-A-15, rouletted, sheets of 50(5x10)
black/light blue, 1*