20 Dollars

The paper series Australian $20 ran from 1974 until it was superseded by the polymer note in 1994, making it one of the longer-lived denominations before the RBA's staged transition away from cotton substrate. The signature combinations span nearly two decades of governors and secretaries, and the Knight & Stone issues are notable for appearing in two distinct serial number typefaces — the earlier straight-limbed OCR-style font replaced a simpler roman face mid-run, a change that creates real variety within what otherwise looks like a single issue type.