Yugoslavia: Airmail labels

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

Year: 1930, Gummed. Günter Mair's catalogue no: - YUG-A-12, perforated 11 ¼ ,sheets of 12(3x4),
black/light grey-blue, 4****

Year: 1932, Gummed. Günter Mair's catalogue no: - YUG-A-14, perforated 11 ½ , sheets of 25(5x5),
black/light grey-blue, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - YUG-A-15a, perforated 10 ½ , 112 labels in a sheet of 120(10x12), ref.: "Obrazac 718", black/light grey-blue, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - YUG-A-16, perforated 11 ¼ ,sheets of 36(4x9), 
black/light grey-blue, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - YUG-A-18, perforated 11 ½ , sheets of 120(10x12), black/light grey-blue, 4****