20 Dollars

Australia's polymer banknote program was a genuinely significant development in currency security, piloted domestically before the technology was licensed internationally. The $20 was part of the complete polymer series that replaced the original paper issues through the 1990s and into the 2000s, with successive signature combinations here tracking two governor transitions at the Reserve Bank — Macfarlane's tenure ending in 2006 when Stevens took over — while Ken Henry remained as Treasury Secretary throughout, lending the series an unusual continuity on the fiscal side.

Note Printing Australia, a wholly owned subsidiary of the Reserve Bank itself, produced all domestic polymer notes at its Craigieburn facility in Melbourne.