The monument was built in 1991. It was commemorated by Hassanal Bolkiah on 18 July 1991.[2] The monument commemorates the production of the billionth barrel of oil produced in the onshore oil field in Seria
อนุสาวรีย์ถูกสร้างขึ้นในปี 1991 It was commemorated by Hassanal Bolkiah on 18 July 1991.[2] The monument commemorates the production of the billionth barrel of oil produced in the onshore oil field in Seria