9999 SILVER PROOF COLOURED Half Dollar COIN. 2nd release in five coin series. 99.99% pure silver. Limited mintage 5,000. Numbered Certificate of Authenticity. The Perth Mint will release no more than 5,000 of. DREAMING DOWN UNDER KANGAROO 2021 1/2oz. 9999 SILVER PROOF COLOURED COIN. Silver Content (Troy oz). Minimum Gross Weight (g). We Take Your Satisfaction Very Seriously. Coins should remain in their original holders. Please pay within 7 days.