Australia, 2017 1 ounce 1 Cent Proof
In 2017 & 2018 Australia issued some one ounce coins depicting their first decimal coins. In 2017 they issued the 1 Cent coin, now weighing 1 ounce of pure silver. The coin is in Proof condition, in its original box and has a certificate. Most importantly they only made 1,500 of these!