20 Dollars 40 Years of Currency Interchangeability

This note commemorates four decades of the Currency Interchangeability Agreement between Singapore and Brunei, signed in 1967 — an arrangement that has outlasted virtually every comparable monetary pact in the region and remains in force today. Under the agreement, both countries' dollar notes are accepted at par in each other's territory, a practical arrangement that has survived decolonization, the expulsion of Singapore from Malaysia, and significant divergence in the two economies' trajectories.

The polymer substrate here is functionally identical to the circulating series, printed by Note Printing Australia on the same Guardian platform. Brunei issued a matching commemorative 20-dollar note simultaneously.