Singapore, 50 Dollars, issued in 2017. Issued to commemorate the 50th anniversary of the Currency Interchangeability Agreement with Brunei. Front: Encik Yusof bin Ishak, Singapore's first president. 50th Anniversary logo at left with Simpur, prominent Brunei flower, and Singapore orchid. Flowers in full bloom symbolising the flourishing friendship between countries. Transparent window shows Istana Nurul Iman (Brunei) and Istana (Singapore). Back: Solders at right, students at the bottom with Brunei's Ulu Temburong National Park and Singapore Botanic Gardens at the top. All images reflecting close ties between both countries in various areas.