Trinidad and Tobago: Airmail labels

Here are the first airmail labels from Trinidad & Tobago.

Year: 9.1929, Gummed. Günter Mair's catalogue no: - TAT-A-1b, perforated 12, sheets of 8(2x4)
watermarks, dark blue/cream, 4****

Year: 9.1929, Gummed. Günter Mair's catalogue no: - TAT-A-1a, perforated 11 ½ , sheets of 8(2x4)
watermarks, red/cream, 4****

wrong cut perforation