$20 1993 Fraser/Evans Last Prefix UNCDenomination $20 Year 1993 Signatures Fraser Evans Grade Uncirculated This is a last prefix banknote. The "prefix" refers to the letters at the beginning of the serial number. In this instance the last prefix was 'ADK'. Obverse (Front)Sir Charles Kingsford Smith Aviator who in 1928, made the first transpacific flight from the US to Australia. He also made the first non stop crossing of the Australian mainland, the first flights between Australia and