Tom Kuhn's sixtieth birthday in 2003. Construction was similar to a Roller Woody, except with hollow sides and removable metal weight rings, and a fixed gap width, in addition to the metal hubs for its axle, all similar to the RD-1.
There are two more variations out there in low numbers. One was a mistake, in which the TK60 was made in the RD-1 shape. The other featured a stain-over-stain finish for a two-color effect with an underlying redness. Only a few of each were ever made.
The design for this special model was also used for the RD-2.