Senegal: Airmail labels

Here are my first airmail labels from Senegal.

Year: 1930, Ungummed. Günter Mair's catalogue no: - SEN-A-3a, imperforated, sheets of 25(5x5)
black/pink, 4****

Year: 1931, Ungummed. Günter Mair's catalogue no: - SEN-A-3b, imperforated, sheets of 25(5x5)
black/blue or grey-blue, 4****