In 1919, the Australian Government proposed to replace pennies and halfpennies with square coins featuring a Kookaburra on their reverse. These trial pieces were never circulated but they were destined to become some of Australia’s rarest and most valued numismatic collectibles. This set of three 2019 25c Fine Silver Proof Coins are inspired by the kookaburra penny trial pieces, for collectors and fans of Australian currency history.