The 1966 5c Royal Australian Mint Proof Strike Coin is a remarkable piece from the inaugural year of Australia's decimal currency. This coin, struck with a mirror-like proof finish, features the effigy of Queen Elizabeth II designed by Arnold Machin on the obverse, inscribed with "ELIZABETH II" and "AUSTRALIA 1966." The reverse showcases the iconic echidna, a design by Stuart Devlin, with the denomination prominently displayed. The exquisite detail and premium quality make it a valuable addition to any collection. Enhance your numismatic collection with this timeless piece of Australian history.