In 2015 to celebrate Her Majesty Queen Elizabeth II the Longest Reigning Monarch, the Perth Mint released a special Limited Issue Longest Reigning Monarch $25 Twenty Five Dollar Gold Proof Coin struck in solid fine .9999 Gold weighing one-quarter of an ounce of pure Gold Certified Slabbed and Graded by PCGS as PR70 DCAM.
The reverse designed by Natasha Muhl features the Royal Cypher surmounted by St Edwards Crown while the obverse depicts Ian Rank Broadley's portrait of Her Majesty Queen Elizabeth II.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.