The TK Sixty or TK 60 was a special release to celebrate Tom Kuhn's 60th birthday. Limited quantities were made. The RD-1 had already been released, so this was the first standard shaped release of their new wood models with weight distribution.
This one is the same design as the RD-2, which was released in 2004. Only this one carries a special logo, and is stained. The RD-2's released later were either painted or natural wood.
