10 Ringgit

Brunei's Currency and Monetary Board has operated under a Currency Interchangeability Agreement with Singapore since 1967, meaning this note circulated legally — and at par — in Singapore throughout its entire print run. That arrangement, still active today, is uncommon enough that Brunei notes were routinely spent, held, and banked across the Causeway as freely as Singapore's own currency.

Thomas De La Rue printed the series through the transition period following Brunei's 1984 independence from British protection, a moment that gave the Currency Board renewed political weight without prompting any dramatic redesign.