Trial pieces from the Sarawak raj are poorly documented, and uniface strikes — showing only the obverse die with a plain or blank reverse — were typically produced to test die alignment, metal flow, or planchet preparation before committing to a full production run. Charles Vyner Brooke had assumed power in 1917 following his father Charles Anthoni's death, and the 1920 coinage represents one of his earliest independent issues. The Royal Mint in London struck Sarawak's coins throughout this period under contract.
Trial pieces from the Sarawak raj are poorly documented, and uniface strikes — showing only the obverse die with a plain or blank reverse — were typically produced to test die alignment, metal flow, or planchet preparation before committing to a full production run. Charles Vyner Brooke had assumed power in 1917 following his father Charles Anthoni's death, and the 1920 coinage represents one of his earliest independent issues. The Royal Mint in London struck Sarawak's coins throughout this period under contract.