Silver Krugerrand
The Krugerrand was the first one ounce bullion coin to be mass produced by a refiner, with South Africa making its name as one of the most prolific gold producing countries in the world. Since then, many other nations have created their own gold and silver coins, overtaking the South African Mint.
In 2017, a silver proof Krugerrand was issued as a limited-edition collectable. Its success led to the Mint producing a bullion edition in 2018 at .999 fineness, which it continued to do ever since.