The KM number is a reffrence to the Krause world catalouge So here goes LOL KM 149 weight 14.9700g 0.8000 silver 6269 minted and the copy I have has it at $23 in fine condition There was also a 5R produced in nickle plated copper
Those coins are fairly scarce, they are selling in South Africa for $200 a piece. Mintage of only 6000. Minted for Mandela's inauguration. Cheers