50 Dollars

Singapore's Board of Commissioners of Currency was established in 1967 specifically to issue notes following the dissolution of the Board of Commissioners of Currency, Malaya and British Borneo — itself a consequence of Singapore's abrupt separation from Malaysia in 1965. The two-year gap between separation and first issue reflects how long it took to negotiate the currency interchangeability agreement with Malaysia and Brunei, which kept the old Malayan dollar in circulation longer than anyone had planned.

Four signature combinations exist across this series. The transition from Lim Kim San to Hon Sui Sen as Finance Minister in 1967 accounts for the change, with the red seal variants reflecting a parallel administrative distinction in how notes were formally authorized.