Australian One Cent
The Royal Australian mint first began producing proof coins at the introduction of decimal currency in 1966 with 18,066 proof sets containing 1c to 50c minted in 1966. They weren't issued in 1967 and 1968, but from 1969 they were issued in every year as part of the year's proof set.
These featured mirror fields paired with a matte relief for a stunning deep cameo finish.
In 1985 Australia's coin designs were updated with the Maklouf portrait of Queen Elizabeth II. This was a short lived series concluding with the end of the one cent series in 1991.
Proof one cent coins were issued for commemorative purposes in 2006 and 2010, the latter being part of the Decimal Currency Heritage set, a rare issue with just 400 produced.