2018 $1 Kangaroo Series-Seasons Change Frosted Uncirculated Fine Silver Coin. As the young Eastern Grey Kangaroo grows and changes with the season, it matures into a beloved Australian icon. In a setting as quintessentially Australian as the bush and under the country's famous sun, this young kangaroo seeks the shade during the summer. Mintage 5000. Please contact Adelaide Exchange Jewellers to find out more on this item.