South Africa pioneered modern bullion coinage when it first issued the Krugerrand on 3 July 1967 to help market South African gold; it is the first modern bullion coin and is still issued today.
Gradually, the South African Mint started diversifying the range, first by issuing fractional Krugerrands, then by introducing different designs to the gold quarter-ounce (1/4 oz) format. These include the Protea series, the Natura series, as well as one-year types that do not fall into a particular series. The quarter-Krugerrands retain their specifications (22-carat gold) while the other coin series issued after 1994 are 99.99% gold; just as the quarter-Krugerrand though, they contain exactly a quarter ounce of pure gold or 1/4 oz Absolute Gold Weight (0.250 oz AGW).
This coin is part of the UNESCO Man and the Biosphere coin series; in 2018, the South African Mint issued two gold quarter ounces and two silver ounces in it. This coin features a Rhino and her calf.
The South African Mint says about it:
"Introduced in 2015, The UNESCO Man and the Biosphere coin series features the Waterberg Biosphere Reserve (WBR) in 2018. A pristine wilderness and important water catchment area for the arid region, the biosphere is situated within the Bushveld District in the Limpopo Province. Preservation of the water resources was one of the main reasons for establishing the biosphere reserve.
A black rhinoceros or hook-lipped rhinoceros (Diceros bicornis) mother and calf are featured on this R2 (1/4oz) 24ct gold coin. The first black rhino was introduced onto private land in the Waterberg in August 1990, and today, three founding populations of black rhinos have been established in the area, one in the Marakele National Park (WBR core area) and two on private land (WBR buffer zone)." | 
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