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They were printed in the UK.
The Straits Dollar was initially printed by Thomas de la Rue of London at their UK plants from 1901 until 1930:
and later, from 1931 to 1935, by Bradbury Wilkinson at their plant in New Malden in Surrey:
The Straits Dollar was replaced by the Malayan dollar in 1939, at an exchange rate of 1:1
In fact, even after independence, Singapore currency notes continued to be printed in the UK right up until 1984:
Singaporeβs currency notes were initially printed in the British plants of Bradbury Wilkinson & Co Ltd and Thomas De La Rue Ltd. In 1984, Thomas De La Rue established a plant inΒ JurongΒ for the printing of Singapore currency notes