Australia | 20 Dollar, 1991 | Obverse: Portrait of Sir Charles Kingsford Smith (1897-1935), often called by his nickname Smithy, was an early Australian aviator. In 1928, he earned global fame when he made the first trans-Pacific flight from the United States to Australia | Reverse: Portrait of Lawrence Hargrave (1850-1915), was an Australian engineer, explorer, astronomer, inventor and aeronautical pioneer | Watermark: Captain James Cook |