2001 Australia Gregorian Millennium Bi-Metal $20 Coin
 
This proof-like, bi-metal coin was minted and inspected by The Perth Mint to commemorate the year 2001, the start of the third millennium according to the modern Gregorian calendar.
 
Includes COA and display box.
 
From the COA:

"The coin features a 99.99% pure gold border designed as a contemporary watch, to mark the modern method of time keeping. The hands indicate 8.00am in Western Australia, which is 0.00 Greenwich Mean Time When the new millennium officially starts. The second hand shows one second to represent the leap seconds that are occasionally added to synchronise today's highly accurate modern atomic time-keeping with the rotation of the Earth. The border features the words 'Gregorian Millennium 2001'. The name comes from Pope Gregory XIII, who reformed the calendar in line with the solar year in 1582.

The central design is made from 99.9% pure silver and features an observatory and night sky highlighted in colour. The historic observations of the movements of the stars and planets have led to today's accurate methods of time-keeping.

The three depictions of the Earth represent the planet's orbit around the Sun, which takes one year.

The coin is official coinage and lawful currency of Australia, and features the lan Rank-Broadley effigy of Her Majesty Queen Elizabeth II on the obverse. Each coin weighs approximately 14.53g, measures 32mm in diameter and has a face value of A$20.

No more than 7,500 individual Australia 2001 Bi-metal Millennium coins will be issued by The Perth Mint."