Chancellor of the National University of Singapore between 1965 and 1970. $5 banknote The gold-ringed cowrie is featured on the obverse background of the banknote. Its reverse carries the theme of Garden City and features the 200-year-old tembusu tree at Singapore Botanic Gardens, as well as Singapore's national flower Vanda Miss Joaquim. Yusof was a keen-gardener who once made a living growing Orchids in Gombak, Kuala Lumpur before his appointment as president. $10 banknote The wandering cowrie is featured on the obverse background of the banknote, the most-commonly found cowrie in Singapore. Its reverse carries the theme of sports and features sportsmen playing badminton, soccer, sailing, jogging and swimming. Yusof was an active sportsman in his secondary school days, and won the national boxing title and the lightweight weightlifting championship. The banknote was the first denomination in the series printed in polymer. 10 million bills were first released to the general public as a trial, and were the first in Singapore to be successfully dispensed from Automated teller machines (ATMs) and be used in payment involving machines. With the successful trial, MAS decided to release polymer versions of the , and for circulation. $50 banknote The cylindrical cowrie is featured on the obverse background of the banknote. Its reverse carries the theme of Arts and features two paintings and four musical instruments. The pipa, kompang, veena and violin represent the musical instruments for different cultures in Singapore. Cheong Soo Pieng (creator of Drying Salted Fish) and Chen Wen Hsi (creator of Gibbons Fetching the Moon from the Water) are two artists who created a new type of fine arts in Singapore that influenced other local artists, in which their two paintings are featured. $100 banknote The swallow cowrie is featured on the obverse background of the banknote. Its reverse carries the theme of youth and features a National Service officer with his ceremonial sword standing against the tower of the SAFTI Military Institute, uniformed youths representing Singapore Red Cross, St John's Ambulance Brigade, Singapore Scout Association and the National Police Cadet Corps. $1,000 banknote The beautiful cowrie is featured on the obverse background of the banknote. Its reverse carries the theme of government featuring the buildings of the three branches of government: The Parliament House, Old Supreme Court Building and Istana, representing the Legislative, Judiciary and Executive powers respectively. The Istana is the president's official residence, built in 1869 which