100 Dollars - Hassanal Bolkiah 25 Years - Currency Board

Issued to mark the 25th anniversary of the Brunei Currency and Monetary Board, established in 1967 when Brunei introduced its own dollar pegged at par with the Singapore dollar — an arrangement that, unusually, remains in force to this day under the Currency Interchangeability Agreement. The Board itself was a precursor to full monetary independence, since Brunei would not establish a proper central bank until 2011.

At 46.65 g of .917 gold, this is a substantive bullion-adjacent commemorative rather than a token issue — the gold content alone makes it a meaningful store of value independent of its numismatic premium.