Question: what are the most expensive australian coins?
Answer: The Proof 1930 Penny is the 'King' of Australian coin rarities. Three examples are privately held, the most recent sale occurring in 2011 when the famous 'Hagley', 'Paxman' Proof 1930 Penny sold for $1.05 million. The Proof 1930 Penny is the world's most valuable copper coin of the modern era.