Brunei. Monetary Authority of Brunei Darussalam. Negara Brunei Darussalam (State of Brunei Darussalam). 2017 Commemorative Issue to celebrate 50 years of economic agreement between Brunei and Singapore. 50 dollars Type 2017. Introduction: July 7, 2017. Dimensions: 158 x 75 mm. Watermark: shadow image unknown. Material: Polymer (Guardian). No security thread. Printed in Australia. Front and back: polychrome printing predominantly gold, yellow and brown. Description of the front: Security background made up of repeating ornamental shapes. Prefix and ascending numbering in black and in vertical and horizontal. On the right, a portrait of Sultan Hassanal Bolkiah Mu’izzaddin Waddaulah in ceremonial uniform. Coat of arms of Brunei in red. In the center, a “rancah rancah” flower (Cosmos caudatus). On the left, the Jame ’Asr Hassanil Bolkiah Mosque in Bandar Seri Begawan. Texts in Malay. Signature: Haji Hassanal Bolkiah. Description of the back: Texts in English and Malay. Royal Guard soldiers, four students in task force and the rope suspension bridge of Ulu Temburong National Park.