The Portrait Series of currency notes is the fourth and current set of notes to be issued for circulation in Singapore. It was first introduced on 9 September 1999 by the Board of Commissioners of Currency, Singapore (BCCS), whose role was since taken over by the Monetary Authority of Singapore (MAS) post-merger.
This series features the portrait of Yusof bin Ishak, the first president of Singapore.[1] The design has been simplified and new security features were introduced. Polymer versions of this series were released for general circulation by MAS as of 4 May 2004.