Straits Settlements: Airmail labels 2

Here a couple more of the airmail labels from Strait Settlements.

Year: 1931, Gummed. Günter Mair's catalogue no: - STS-A-3a, rouletted, sheets of 30(3x10), 4mm between 2. and 3. line, ref.: "P. & T.-Mail 25", black/greenish grey-blue, 4****

 






Year: 1933?, Gummed. Günter Mair's catalogue no: - STS-A- ?, rouletted, similar to STS-A-5 i've
posted here, but a bit smaller, size: 40x20mm, black/greenish grey-blue.