What it does
This Determination, made under subsection 13A(1) of the Currency Act 1965, fixes the physical and design specifications for a set of Commonwealth coins by listing denomination, metal composition, weight tolerance, dimensions, shape, edge treatment and obverse and reverse designs for each coin in Schedule 1 (see s 3 and Schedule 1). The Determination comes into force on the day after registration (see s 2 and the front matter). It is a descriptive instrument: each Schedule item specifies the required physical and visual features for a particular coin issue (s 3). Section 4 states that the specifications in Schedule 1 do not affect any other determination of the specifications of a coin, which permits multiple determinations to exist concurrently.
Mechanically, the instrument performs three functions. First, it declares denomination and composition for each listed coin. Examples: several $5 coins are specified as at least 99.9% silver, with standard weight 36.31 g ± 0.54 g (Items 1, 2, 3, 10); a $1 coin is specified as at least 99.9% silver and one ounce fine silver with weight 31.635 g ± 0.50 g and inscriptions including “ONE OUNCE FINE SILVER” (Item 4). Second, it fixes precise tolerances and maximum dimensions: standard weights with allowable variation, maximum diameter and maximum thickness for each item are enumerated in the Schedule (s 3; Schedule 1 entries). Third, it fixes visual elements for obverse and reverse faces: the obverse details an effigy of Queen Elizabeth II with the initials “IRB” and specific inscriptions including the year, and the reverse sets out detailed pictorial elements and inscriptions for each design (Schedule 1).
The Schedule covers a mixture of metal types and issuer features: high‑purity precious metal issues (silver and gold including 99.99% gold and 99.9% silver), base metal circulation alloys (copper, aluminium, nickel), partially gold‑plated silver, and coloured pad‑printed designs. Edges are specified with wording such as “continuously milled” or a 14‑segment edge with a pattern of milled and plain segments. Some obverse inscriptions carry the year 2006, others 2007, reflecting different issues listed in the same Determination (see multiple Schedule entries).