2026 $1 60th Anniversary of Decimal Currency 'C' Mintmark Silver Proof CoinThe adorable cartoon character "Dollar Bill", helped Australians make the changeover on 14 February 1966 without a hitch. Since then the Mint and Australian coins have adapted to the changing times and requirements. The original round, and 80 per cent silver, 50c coin was updated to cupronickel and given its distinctive 12 sided dodecagon shape from 1969. The $1 coin was introduced in 1984, followed by the $2 coin in 1988. While the 1c and 2c coins