One Dollar Mob of Roos, Coin Type from Australia - detailed information

1984 saw the introduction of the dollar coin denomination in Australia, replacing the earlier banknotes.

As the introductory information by the Royal Australian Mint in 1984 explains:

"The coin has several distinctive features; it has a golden colour which distinguishes it from cupro-nickel or bronze coins; the coin is thicker compared to other coins of similar diameter, and the edge, comprised of seven plain and seven milled segments, makes the new coin distinctive visually and to the touch. However, the unusual edge design does not inhibit the coin's ability to roll, so that it can be used in vending machines.

The reverse design, by featuring the kangaroo, continues the Australian fauna theme of the current circulating coinage. The kangaroo is Australia's best known native animal, and is instantly identifiable with Australia. Its ability to hop long distances and jump high obstacles has made this marsupial world famous."

The coin type is known in Australia as the "mob of roos" type ("roo" being short for kangaroo).

The composition is 92% copper, 6% aluminium and 2% nickel.

Australian decimal coins have carried four portraits of Her Majesty Queen Elizabeth the Second.

The inclusion of an effigy of the Queen on the obverse of Australia's coinage is mandated by Regulation 4 (c) of the Currency Regulations made under the Currency Act 1965. Portraits of Her Majesty have all faced to the right in line with a convention, said to have commenced with Charles II (1660-1685), that the new Monarch's portrait would face in a direction opposite to that of their predecessor.

Five kangaroos (hence the coin type is known as the "Mob of Roos"), the closest facing right but looking to left; below, and overlaid on them, the denomination and value 1 DOLLAR.