50 Ringgit 50 Years of Currency Interchangeability

The 2017 Currency Interchangeability Agreement commemorative marks fifty years of the monetary arrangement between Brunei and Singapore, under which both nations' dollars are accepted at par in either country — one of the few functioning currency unions between sovereign states. The agreement, formalized in 1967 when Singapore separated from Malaysia, has held without interruption through Asian financial crises and regional turbulence that destabilized far larger economies.

Polymer issues from AMBD are rare; most of the sultanate's circulating series has remained on paper. The switch in substrate for this commemorative was almost certainly driven by Singapore's parallel issue, which also appeared on polymer for the anniversary.