Colombia: Airmail labels

Here are first postal issue labels from Colombia.

Year: 1932, Gummed. Günter Mair's catalogue no: - CLM-A-1a, perforated 11 ¾ , sheets, ultramarine or dark violet-blue/white, 4****

Year: 1933, Gummed. Günter Mair's catalogue no: - CLM-A-1b, perforated 11, sheets,
black-blue or violet-blue or dark blue/white, 4****

Year: 1943, Gummed. Günter Mair's catalogue no: - CLM-A-3, perforated 11, sheets of 75(5x15),
violet-blue/red/yellow/black/white, 4****