Where do you think are the South African Krugerrand coins made? Right, in South Africa. But this year some of them were minted in Germany.
The South African Mint was one of the many mints that participated in this year's World Money Fair in Berlin, and it issued a special Krügerrand version on that occasion. After all, the Kruger portrait still in use today was designed in 1892 by Otto Schultz from Berlin. Thus a special edition was minted in Berlin this year, which has the mint's logo (a crowned bear) and the "OS" initials.
Here is an article about the coin: http://www.muenzenmagazin.de/startseite0602/Kruegerrand.htm The text is in German, but it also has some pictures of the piece.
Christian