This is an interesting label from Strait Settlements.
The Straits Settlements were a group of British territories located in Southeast Asia.
Originally established in 1826 as part of the territories controlled by the British East India Company, the Straits Settlements came under direct British control as a crown colony on 1 April 1867. The colony was dissolved as part of the British reorganisation of its South-East Asian dependencies following the end of the Second World War.
The Straits Settlements consisted of the individual settlements of Malacca, Penang (also known as Prince of Wales Island), Christmas Island (until 1946 and part of Singapore until 1957) and Singapore, as well as (from 1907) Labuan, off the coast of Borneo. With the exception of Singapore, these territories now form part of Malaysia. (Wikipedia).
Year: 1933, Gummed, Günter Mair's catalogue no: - STS-A-5, rouletted, sheets of 30(3x10) or
54(6x9), ref.: "P & T-Mail 25", size: 42.5x20mm, black/greenish grey-blue, 4****