5 Cents - Elizabeth II (3rd Portrait - Masterpieces in Silver; Echidna Proof)

The 1991 Masterpieces in Silver series was issued by the Royal Australian Mint to celebrate the decimal currency system, which had replaced the imperial pound twenty-five years earlier. This specific collection, titled The Decimal Currency Proof Set, served as a numismatic tribute to the reverse designs that had defined Australian coinage since 1966. These proof-quality coins were struck in sterling silver rather than the standard cupro-nickel, elevating them to a commemorative status intended for serious collectors rather than circulation.

The 5-cent piece features the iconic echidna design by Stuart Devlin, an acclaimed goldsmith and designer who was commissioned to create the reverses for Australia's original 1966 decimal series. Devlin’s work, which captures the distinct natural heritage of Australia, was widely praised for its elegance and remains a hallmark of Australian numismatics. The obverse depicts the third effigy of Queen Elizabeth II, designed by Raphael Maklouf, which was the standard portrait used on Commonwealth coinage throughout the late 1980s and early 1990s.