1991 Australia Kookaburra 1 oz. 999 Silver Coin – Key Date BU Perth Square Capsule. 1991 Australia 1 oz Silver Kookaburra – Early Date – Mintage? Up for sale is a 1991 Australian 1 oz Silver Kookaburra from the Perth Mint – an appealing early date in the series and a popular choice among collectors. As one of the earliest issues, it remains a cornerstone piece for collectors building a complete Kookaburra year set. Coin Highlights Year: 1991 Weight: 1 troy oz Purity. Please review all photos carefully. The exact item shown is the item you will receive unless otherwise stated. Any included box, capsule, or COA will be shown in listing photos or described in the listing details. 1991 Australia 1 oz Silver Kookaburra – Early Date – Mintage? Up for sale is a 1991 Australian 1 oz Silver Kookaburra from the Perth Mint – an appealing early date in the series and a popular choice among collectors. The 1991 Kookaburra had a mintage of 300,000 coins. Weight: 1 troy oz. Early date in the Kookaburra series. Mintage of 300,000. Highly collectible early-series design. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. 1995 Australia Kookaburra 1 oz. 999 Silver Coin – Key Date BU. 1998 Australia Kookaburra 1 oz.