50 Sen - Omar Ali Saifuddin III

Brunei's 1967 coinage series was issued in the immediate wake of the country's 1959 constitution, which had established internal self-governance while retaining British protection — a careful arrangement Omar Ali Saifuddin III had personally negotiated. The 50 sen was the highest denomination in that series, and its copper-nickel composition marked a deliberate break from the silver coinage of earlier Straits Settlements issues that had previously circulated in the region.

Omar Ali Saifuddin abdicated the following year, in 1968, in favor of his son Hassanal Bolkiah.