Brunei's monetary authority was established in 1977, separating the sultanate's currency functions from the Currency Board arrangement it had shared with Singapore and Malaysia since 1967. The interchangeability agreement with Singapore, however, remained in force — Brunei dollars and Singapore dollars have traded at parity under a formal Currency Interchangeability Agreement continuously since that year, meaning coins of this type circulated effectively across both jurisdictions throughout the series run.
Brunei's monetary authority was established in 1977, separating the sultanate's currency functions from the Currency Board arrangement it had shared with Singapore and Malaysia since 1967. The interchangeability agreement with Singapore, however, remained in force — Brunei dollars and Singapore dollars have traded at parity under a formal Currency Interchangeability Agreement continuously since that year, meaning coins of this type circulated effectively across both jurisdictions throughout the series run.