In 2016 to celebrate the Queens 90th Birthday, the South African Mint released a very Limited Issue Tenth Krugerrand Gold Proof Coin struck in solid 22 Carat Gold weighing one-tenth of an ounce of pure Gold with a special Queens 90th Birthday Mint Mark.
The reverse of the coin designed by Coert Steynberg depicts a Springbok Antelope one of the national symbols of South Africa with a special "QEII 90" Mint Mark and the obverse has the portrait of Paul Kruger.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.