South Africa produced 3,500 of the 9-coin proof sets in 1952. Acording to the 2010 edition of the Standard Catalog of World Coins, the set is valued at US$45.00. Note that the set contains 1.0223 troy ounces of silver (six of the nine coins are 50% silver), which means that it has a "melt" value (as of May 25, 2013, with silver at US$22.50 per troy ounce) of US$23.00.
Note also that 12,000 of the 11-coin proof sets were also produced in 1952. These, by virtue of the inclusion of the gold pound and half-pound coins, are valued by the SCWC at US$400. However, those two additional coins contain 0.3532 troy ounces of gold and thus have a "melt" value (as of May 24, 2013 with gold at US$1387 per troy ounce) of US$489, so the US$400 number is clearly a bit low.
5s silver
No, Lynette was born in 1952.
The most medals South Africa has won in an Olympics is 10 and was done at the 1920 Summer Games in Antwerp and the 1952 Summer Games in Helsinki.
Douw Steyn was born on December 19, 1952, in South Africa.
Blaise Koch was born in 1952, in East London, South Africa.
I have a 5 shillings coin 1652-1952 that I want to sell contact me on 0845773125.
Georgina Kriel was born on July 17, 1952, in Johannesburg, South Africa.
Ricky Fataar was born on May 9, 1952, in Durban, South Africa.
Henion Han was born on February 8, 1952, in Johannesburg, South Africa.
Lee Brilleaux was born on May 10, 1952, in Durban, Natal, South Africa.
The most medals won by South Africa at the Summer Olympics was 10 at the 1920 Games in Antwerp and the 1952 Games in Helsinki. The most gold medals won by South Africa at the Summer Olympics was 4 at the 1912 Games in Stockholm.
You are asking about the Five Shilling coin issued by South Africa in 1952 in commemoration of the 300th Anniversary of the founding of Capetown. The coin bears a portrait of King George the Sixth (of Great Britain) on the front and and an image of a Schooner in Capetown harbor on the back. The coin is 50% silver and has an ASW (Actual Silver Weight) of 0.4546 troy ounces. Numismatically, it is worth perhaps a dollar or two over the silver value in circulated condition, about US$18 in Uncirculated condition, and maybe US$20 or so in Proof.