2015 $1 Kangaroo Series Fine Silver Proof Coin, Explorers First Sightings. Kangaroos were a curiosity to early Australian settlers. Kangaroos were depicted in words and artworks which seem inaccurate today, but are filled with the beauty of these animals capturing people's imaginations. Certificate of authenticity is included with this coin, with this coin numbered 339. Mintage 10,000. Please contact Adelaide Exchange Jewellers to find out more on this item.