The FCC ID of the SIIG MiniTouch was registered in 1991, which ties in with my theory about a change in numbering of Himake switches. According to SIIG, it was a one-year production run from January 2002 to January 2003, within which time, they had two different keyboards: SMK switch version from Taiwan, and Himake version from China. Also, the keycaps changed several times, including lasering and dye-sub, and even the Himake version had two different switches used for the function keys (standard and reduced travel). All within one year.
I only learnt of the Suntouch a few weeks back, so I don't know whether this has any similar oddities.